That is, the (vector) derivative of a constant is zero. The potential in the infinity is defined as zero and it increases as we move toward a positively charged sphere as a positive work would have to be done moving a positive charge against the electric field produced by the sphere. right? It only takes a minute to sign up. Finding the general term of a partial sum series? For points outside the sphere (r > R). S 2 : At any point inside the sphere, the electrostatic potential is 100 V. Which of the following is a correct statement? What's the electric field in a homogeneously charged hollow sphere/Spherical capacitor? Find the potential inside and outside a spherical shell of radius R 4,009 views Apr 3, 2020 65 Dislike Share Save Dr.Nabeel Rashin 1.04K subscribers Example. That doesn't quite followdon't you mean, 2022 Physics Forums, All Rights Reserved, Problem with two pulleys and three masses, Newton's Laws of motion -- Bicyclist pedaling up a slope, A cylinder with cross-section area A floats with its long axis vertical, Hydrostatic pressure at a point inside a water tank that is accelerating, Forces on a rope when catching a free falling weight. Electromagnetic radiation and black body radiation, What does a light wave look like? It is exactly in the form of a zonal harmonic From page 138, Table 3.1 in Griffiths (3rd edition), [tex]P_1(x)=x[/tex]so [tex]P_1(\cos\theta)=\cos\theta[/tex]. Proof that if $ax = 0_v$ either a = 0 or x = 0. If the hollow sphere is conducting, then potential inside hollow sphere is constant and outside the sphere, the potential is inversely proportional to distance from the center of sphere. Physics 38 Electrical Potential (12 of 22) Potential In-, On, & Outside a Spherical Conductor, Potential inside and outside a sphere with surface charge density 3-18 separation spherical, ED2.16. (no joke, his exact words), @HummusAkemi your professor is solving the problem of a. $$ 0. As you point out, the, E, inside the shell is zero, so the potential does not change as you go in from the surface. Your 'professor' seems to be referring to a different problem to the one you are describing. Here I use direct integration of the expression for the electric potential to solve for the electric potential inside and outside of a uniformly charged sphe. If there is no charge inside the sphere, the potential must be the solution of the equation Find the potential inside and outside a spherical shell of radius R (Fig. He didn't mention whether it was conducting or not (but I don't believe it matters, right?). Zorn's lemma: old friend or historical relic? Please can you provide a full statement of the problem from which this question arose. This will require actual calculus, but fortunately the integral isn't too tough. The book says that a hollow charged sphere has an equal potential at all points on and inside the sphere but the points inside the sphere have zero net electric field for they have no charge. This is much like how it takes no work (against the gravitational field) to move an object horizontally, since there is no change in $mgh$. Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. Our Website is free to use.To help us grow, you can support our team with a Small Tip. You are using an out of date browser. My professor said that "potential is something you can be "flexible" with and if you can set it equal to zero, why don't you?" Is it possible to hide or delete the new Toolbar in 13.1? The potential is defined relative to the infinity - not relative to the center of the shell. How can we make a spherical shell uniformly charged? Why is the surface of a charged solid spherical conductor equal in potential to the inside of the conductor? Un-lock Verified Step-by-Step Experts Answers. How do we know the true value of a parameter, in order to check estimator properties? This "field" does not have a real existence, in the sense, you can't "see" it (not yet, as of 2020). Is there something special in the visible part of electromagnetic spectrum? V A = V B V A V B = E d l. V A = V B . Why does the USA not have a constitutional court? For a spherical Gaussian surface $\Sigma$ within the shell, radius $r$, Gauss' law indicates that, $$ \oint_\Sigma \mathbf{E} \cdot d\mathbf{a} = \frac{Q_{\rm enc}}{\epsilon_0} = 0,$$, since we know that $Q_{\rm enc}$, the charged enclosed by our Gaussian surface, is zero. Would you be weightless at the center of the Earth? If there are charges inside the sphere the potential is different, and can be constructed, for example, using the image charges method. There are two ways of answering your question. for the dipole? Why the electric potential inside a conductor doesn't equal zero? Potential at P due to sphere = V 2 = 4 o R q which is the same for all points inside the shell. Electric potential just outside a spherical shell. wait, i don't get it. Last edited: Feb 11, 2009 Feb 11, 2009 #10 gabbagabbahey Homework Helper Gold Member 5,002 7 JayKo said: Why would Henry want to close the breach? Since there is no field inside the shell, the potential at any point inside the shell is equal to the potential on the surface of the shell, $V=\frac Q {4\pi\epsilon_0}$. Well turns into and since r is constant at R (spherical shell) then an R^2 comes out of the integral and cancels the R^2 in the denominator from the charge density rho = Q / (4 pi R^2). If in a microscopic field the Electric field vary from point to point inside shell? Gauss Theorem:Electric field of an uniformly charged non-conducting spherical shell, Potential inside a hollow charged spherical shell, Potential of a non-uniformly charged spherical shell. Would the answer matter depending on whether the surface is a conductor on insulator, even? Suppose that we have a hollow sphere (spherical shell) whose surface is held at some constant potential V0. Why is it that potential difference decreases in thermistor when temperature of circuit is increased? So, the potential difference between any two points inside or on the surface of conductor is zero. You seem to be attempting to use Coulomb's law; but that is a bad idea. For r R, Potential is a result of the addition of potential due to all the small area elements on the sphere. If not, then the blow up at the origin is due entirely to the dipole potential and so you can say that the potential due to just the shell must be of the form: i see, well, is it possible to assume r->infinity, V=0. Potential inside a hollow sphere (spherical shell) given potential at surface. But electric potential 'V' inside a spherical shell is kQ/R (Q = charge on the spherical shell and R = radius of the shell) We also know that V=Ed for D = distance of the point where we want to find the electric field or the potential . The fact that the potential due to the shell is bounded at r=0 allowed you to determine the values. Thus the superposition of the fields due to the charge distribution on the sphere and the dipole inside should cancel outside the sphere. So inside of a sphere, there is no gravitational force at all! It may not display this or other websites correctly. Would the potential blow up at the origin if there was no dipole there? Could an oscillator at a high enough frequency produce light instead of radio waves? See my answer as user82794 (former diracpaul) therein : Potential inside a hollow charged spherical shell. The first is that potential is defined up to an arbitrary constant, so you can define it to be any constant value inside the shell. After grounding the shell, it is easier to calculate first the electric potential in the outer region, and after that, to take the gradient of the potential in order to find the electric field according to the relation . The potential is defined as the work required to move a charge from infinity to a point. The dipole will induce some unknown charge density onto the shellcorrect? Answer (1 of 8): To calculate potential at any point in the field is a tricky problem and therefore I will discuss it at some length using this question. So we can conclude that the potential inside the spherical shell is constant. Share Cite For a better experience, please enable JavaScript in your browser before proceeding. Since $\mathbf{E}=\mathbf{0}$, this implies that $V = \rm constant$ because of the relationship $\mathbf{E} = -\nabla V$. What is the probability that x is less than 5.92? It only takes a minute to sign up. i suppose the method is called Fourier trick by david griffith? Let us consider a thin spherical shell of radius \( x \) and thickness \( \,dx \) with centre at the point \( O \) as shown in the above Fig. Name of poem: dangers of nuclear war/energy, referencing music of philharmonic orchestra/trio/cricket. If they have no charge, then how do they have a potential in the first place? $$ Potential inside a hollow sphere (spherical shell) given potential at surface homework-and-exercises electrostatics potential gauss-law 14,976 Solution 1 If there is no charge inside the sphere, the potential must be the solution of the equation $$ \nabla^2 \phi =0 $$ with boundary condition $\phi=\phi_0$ on the surface. here why [tex]P_1=1[/itex]? That means there are two di erent regions confusion between a half wave and a centre tapped full wave rectifier, Why do some airports shuffle connecting passengers through security again, Irreducible representations of a product of two groups. Set the reference point at infinity. Last edited: Feb 10, 2010 Suggested for: Electric potential with regards to an insulating spherical shell The best answers are voted up and rise to the top, Not the answer you're looking for? All the data tables that you may search for. as i need to establish the boundary condition to solve for the coefficient of A.thanks, The solution [tex]V(r,\theta)=\frac{1}{4\pi\epsilon_0}\frac{p*\cos\theta}{r^{2}}+\sum_{l=0}^{\infty}A_l r^l P_l (\cos\theta)[/tex] is only valid. Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. Why is the federal judiciary of the United States divided into circuits? How does a non-zero potential exist given that there is no need to do work in moving a charge in forceless field? To learn more, see our tips on writing great answers. What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked. Gausss law guarantees that charge exterior to a given point that is, at larger r ) produces no net field at that point, provided it is spherically or cylindrically symmetric, but there is no such rule for potential, when infinity is used as the reference point. S 1 : At any point inside the sphere, electric intensity is zero. Is this field is microscopic or macroscopic? Can several CRTs be wired in parallel to one oscilloscope circuit? 16. This is illustrated for a positively charged sphere on the diagram below copied from this Hyperphysics page. Nett Electric Field cannot be used to calculate potential. Inside the sphere, the field is zero, therefore, no work needs to be done to move the charge inside the sphere and, therefore, the potential there does not change. Let us derive the electric field and potential due to the charged spherical shell. $\therefore V=-\dfrac{GM}{R}$ equation (3) This value is similar to the value of the potential at the surface of the shell. If it is a insulator, then we cannot say that electric field inside the sphere is zero. Every horizontal position along a certain altitude is at a gravitational equipotential. Potential inside a hollow sphere (spherical shell) given potential at surface. what you working as now? That potential will have a nonzero value due to the charges outside. This means that the interior is equipotential everywhere, and it takes no work to move a charge anywhere within the shell. It can be easily shown using Gauss's Law that a uniformly charged conducting spherical shell has constant potential throughout its interior. Share Cite Improve this answer Follow \nabla^2 \phi =0 We know that as we get closer and closer to a point charge, the electric potential approaches infinity. This equation computes the potential energy due to the gravitational attraction between a point mass and a spherical hollow shell mass when the point mass lies inside the spherical shell. So we expect that in a problem like this the potential might look di erent inside and outside the sphere. It follows that if $Q_{\rm enc}$, it must be that $\mathbf{E} = \mathbf{0}.$. Prove that isomorphic graphs have the same chromatic number and the same chromatic polynomial. Since the potential in the interior of the spherical shell does not change (because the field is zero, E = d V d x ), the difference in potential between any two points in the interior is zero; this in other words means that no work is done in moving a charge inside the spherical shell. The function $\phi=\phi_0$ inside the sphere is a solution, and it is unique. @sammygerbil The (almost) exact words of the problem: "Find the potential of a hollow sphere with radius R held at constant potential V at the surface (r = R)". Electric field inside charged non-conducting spherical shell. The case is analogous to the gravitational potential inside a hollow spherical shell. It is found by integrating the, E, field in from infinity. the object. However, since the weight can be adequately secured, it is not necessarily hazardous. How can you possibly use Coulomb's law when you don't know. Why is there an extra peak in the Lomb-Scargle periodogram? So I'm a bit unclear what you are asking. If he had met some scary fish, he would immediately return to the surface, QGIS Atlas print composer - Several raster in the same layout, Books that explain fundamental chess concepts. well, i just informed by professor the point dipole at the origin will have the potential of [tex]\frac{1}{4\pi\epsilon}\frac{p*cos\theta}{r^{2}}[/tex] inside the sphere (p=dipole moment). V A V B = 0. Why does Cauchy's equation for refractive index contain only even power terms? how you come about this equation?[tex]V_{dip}=\frac{1}{4\pi\epsilon_0}\frac{p*\cos\theta}{r^{2}}=\frac{1}{4\pi\epsilon_0}\frac{p*P_1(\cos\theta)}{r^{1+1}}[/tex]. The problem is envisioned as dividing an infinitesemally thin spherical shell of density per unit area into circular strips of infinitesemal width. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The potential inside will be constant, but will be equal to the potential at the surface of the shell. We know that the gravitational potential inside the shell is the same as on the surface. I had an argument with my physics professor over this. Connect and share knowledge within a single location that is structured and easy to search. Step 3: Net potential at point P As potential is scalar quantity, so net potential at a point will be sum of potentials due to all the charge configurations. @SRIVISHNUBHARAT I am not sure what you mean by microscopic field. All the [itex]B_l[/itex]s must be zero except for [itex]B_1[/itex]---which corresponds to the potential of the dipole which is the only contribution which should be allowed to "blow up" at the origin. The formula V = kQ/R gives the potential at the surface of a spherically symmetrical charge, Q, of radius, R (on the surface of your shell). Find electric potential inside and outside the spherical shell. Why does Cauchy's equation for refractive index contain only even power terms? Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company. E=\frac{1}{4\pi \epsilon _{0}}\frac{q}{r^{2}}\acute{r}. Gravity Force Inside a Spherical Shell For application of the law of gravity inside a uniform spherical shell of mass M, a point is chosen on the axis of a circular strip of mass. Add a new light switch in line with another switch? Potential is a result of the addition of potential due to all the small area elements on the sphere. In any case though, there is no field inside the shell. wait, i don't get it. I don't know if this helps but consider that since the shell is conducting and grounded the field outside should be zero as should be the potential. QGIS Atlas print composer - Several raster in the same layout. My work as a freelance was used in a scientific paper, should I be included as an author? Help us identify new roles for community members, Gausss Law inside the hollow of charged spherical shell. rev2022.12.11.43106. And the relation between the electric potential and the electric field is, Now, the value of the electric field due to spherical shell at point Poutside the sphere will be calculated by the formula. The best answers are voted up and rise to the top, Not the answer you're looking for? Find the Source, Textbook, Solution Manual that you are looking for in 1 click. Electric potential due to a spherically symmetric distribution of charge Example: Consider a spherical shell of radius R with a charge of Q. Want to improve this question? As you are explicitly assigning the potential on the boundary, this is independent from the fact that the surface is conducting or not. [READ IN DETAIL] Gravitational potential at \( P \) due to the whole hollow sphere of inner radius \( b . Why electric field at any point inside a charged shell is always zero? anything to the power of zero is still zero.how to determine ? So, $4\pi {{R}^{2}}\sigma $ is the mass M of the shell. Does a 120cc engine burn 120cc of fuel a minute? The gravitational potential inside the shell is constant even though the field is zero. The electric field is zero throughout the interior of the shell (in other words, there is no force field). This means that you do no work to move a charge from one point to another - which is the definition of "constant potential". The potential anywhere inside will be the same as the potential on the surface. anything to the power of zero is still zero.how to determine [tex]B_l[/tex] ? He claims that the potential inside depends on how far you are from the center and becomes zero at the center ("so that it doesn't blow up"). If the sphere is conductive, then there is no electric field inside. The electrostatic potential on the surface of a charged conducting sphere is 100 V. Two statements are made in this regard. If I placed a second uniformly charged shell out at radius \acute{R}\gt R, the potential inside R would change, even though the field would still be zero. Find the potential inside and outside a spherical shell of radius R (Fig. How does electric flux being equal to zero imply electric field is zero? Making statements based on opinion; back them up with references or personal experience. Find the potential inside and outside a spherical shell of radius R, Electrostatic Potential and Capacitance 04 : Potential due to Charged Spheres JEE MAINS/NEET. Electric field inside and outside a hollow spherical shell. The case is analogous to the gravitational potential inside a hollow spherical shell. Gravitational Potential Energy of a Spherical Shell Table of Content Gravitational potential energy of a spherical shell We all have experienced this instinctively when a big weight is lifted above our head we feel it be a potentially dangerous situation. Textbooks & Solution Manuals Find the Source, Textbook, Solution Manual that you are looking for in 1 click. What is wrong in this inner product proof? Work done is. The potential at a point in space is a property of that location. where q is the total charge on the sphere. Thanks for contributing an answer to Physics Stack Exchange! Nett Electric Field cannot be used to calculate potential. The fact that the field is zero indicates that the potential is constant. We know that electric field inside a spherical shell is 0 . Electric Field and Potential due to a Charged Spherical Shell For a charged spherical shell with a charge q and radius R, let us find the electric field and potential inside, at the centre, and outside the sphere can be found using Gauss Law. The radius's of interest are r = C and r = infinity. In other words, it would be finite as well. Does a 120cc engine burn 120cc of fuel a minute. What is the highest level 1 persuasion bonus you can have? 2.31) that carries a uniform surface charge. The force acting on the point P can be found out by differentiating the potential at . Your conception of work seems to be wrong. Can i put a b-link on a standard mount rear derailleur to fit my direct mount frame. Share Cite Improve this answer 2.31) that carries a uniform surface charge. Wouldn't the potential at ANY point inside the sphere just be V0? Electric Potential of a Uniformly Charged Spherical Shell Electric charge on shell: Q = sA = 4psR2 Electric eld at r > R: E = kQ r2 Electric eld at r < R: E = 0 Electric potential at r > R: V = Z r kQ r2 dr = kQ r Electric potential at r < R: V = Z R kQ r2 dr Z r R (0)dr = kQ R Here we have used r0 = as the To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Set the reference point at infinity. then the potential will be different. According to the definition of potential at some point in electric field: Negative of the work done by the field in bringing unit positive cha. For example, outside a spherical shell with a constant surface charge density the potential falls o like 1=r, but inside that sphere it is constant. CGAC2022 Day 10: Help Santa sort presents! oh i see, i m left with determining the coefficient, [itex]A_l[/itex]. Was the ZX Spectrum used for number crunching? I have a small confusion that whether electric field is zero exactly at centre or within shell everywhere. Exchange operator with position and momentum. Connect and share knowledge within a single location that is structured and easy to search. The shell has a total charge +3q and at it's center is a point charge of charge -q. I know that the E field for r>b would simply be: E = (3q-q)/ (4r^20) and thus the electric potential inside the shell must be the same as the electric potential on the outer shell since there is no E field inside the shell. Can we keep alcoholic beverages indefinitely? If any of the other [itex]B_l[/itex]s were non-zero, you would have other terms where you end up dividing by zero at the origin. To move a test charge inside the conductor and on its surface, the work done is zero because the electric field intensity inside the hollow spherical charged conductor is zero. Solution: For r > R, V = 4 o r Q In this region, spherical shell acts similar to point charge. For Arabic Users, find a teacher/tutor in your City or country in the Middle East. When would I give a checkpoint to my D&D party that they can return to if they die? The second way assumes that you mean the potential is zero at infinity. How to make voltage plus/minus signs bolder? Since the potential in the interior of the spherical shell does not change (because the field is zero, $E = -\frac{dV}{dx}$), the difference in potential between any two points in the interior is zero; this in other words means that no work is done in moving a charge inside the spherical shell. you see, when r=0, the terms blow up. I'm just asking about the inside of the sphere here. with boundary condition $\phi=\phi_0$ on the surface. My doubt is that for thin spherical shell if . (3D model). Finding the original ODE using a solution. Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? V(r)=\frac{-1}{4\pi \epsilon _{0}}\int_{\infty }^{R}{\frac{q}{\acute{r}^{2}} }d\acute{r}\int_{R}^{r}{(0)d\acute{r}} = \frac{1}{4\pi \epsilon _{0}}\frac{q}{\acute{r}}\mid ^{R}_{\infty } +0=\frac{1}{4\pi \epsilon _{0}}\frac{q}{R}. Edition [EXP-2861]. Do bracers of armor stack with magic armor enhancements and special abilities? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Use logo of university in a presentation of work done elsewhere. Find the potential inside and. [tex]A*_{l}r^{l}+\frac{B_{l}}{r^{l+1}} [/tex] you see, when r=0, the terms blow up. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. 1 . In that case: You haven't said anything about the charge outside of the shell. Sort of, one method is to use a "Legendre trick" and multiply each side of the equation by [tex]P_m(\cos\theta)\sin\theta d\theta[/tex] and integrate from 0 to pi. The gravitational potential inside the shell is constant even though the field is zero. I also figured out the problem, after integration: and I forgot to consider the different cases for when x > R (outside spherical shell) and x<R (inside). If the magnitude of the electric field inside a uniformly charged spherical shell is zero then is how potential a non-zero constant equal to the potential of shell itself? MathJax reference. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company. This is because the uniform charge distribution gives the situation spherical symmetry, which is used to constrain the behavior of the electric field on a spherical Gaussian surface. So yes - you are right. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Jul 27, 2018 at 12:42 btw, a personal question if you don't mind? We can first determine the electric field within the shell using Gauss' law, one of Maxwell's equations. Since electric potential at the surface of a spherical shell is finite (Gauss law) , so on moving away from the surface it would fall. What is the potential inside the sphere? It's a theoretical understanding; a framework rather, that serves very helpful in studying how charges, Potential inside a uniformly charged spherical shell [closed], Help us identify new roles for community members. To find the potential inside the sphere (r < R), we must break the integral into two pieces, using in each region the field that prevails there: Notice that the potential is not zero inside the shell, even though the field is.V is a constant in this region, to be sure, so that V = 0thats what matters.In problems of this type, you must always work your way in from the reference point; thats where the potential is nailed down. It is tempting to suppose that you could figure out the potential inside the sphere on the basis of the field there alone, but this is false: The potential inside the sphere is sensitive to whats going on outside the sphere as well. Once you have a function for E, you can integrate it to get your potential V, with respect to . Introduction to Electrodynamics 4th. The field inside is zero. Do bracers of armor stack with magic armor enhancements and special abilities? | Holooly.com Subscribe $4.99/month Un-lock Verified Step-by-Step Experts Answers. The amount of work that has to be done to move a charge $q$ from A to B is equal to $W = q\Delta V$. isn't it = r? Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Consider a thin shell of radius $R$ which has total surface charge $Q$. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Why is the overall charge of an ionic compound zero? Use MathJax to format equations. rev2022.12.11.43106. Correctly formulate Figure caption: refer the reader to the web version of the paper? Add details and clarify the problem by editing this post. Can electric field lines from another source penetrate an insulating hollow shell which is uniformly charged? This applies to a hollow sphere with finite width as well, since we can write that potential as an integral over a bunch of spherical shells, all of which will contribute constants that don't depend on the position r r inside the sphere. JavaScript is disabled. V(r)=-\int_{\omicron }^{r}{E.dI}=\frac{-1}{4\pi \epsilon _{0}}\int_{\infty }^{r}{\frac{q}{\acute{r}^{2}} }d\acute{r} = \frac{1}{4\pi \epsilon _{0}}\frac{q}{\acute{r}}\mid ^{r}_{\infty } =\frac{1}{4\pi \epsilon _{0}}\frac{q}{r}. Why doesn't the magnetic field polarize when polarizing light? Asking for help, clarification, or responding to other answers. xKL, bzZ, VUnC, rSXv, YDY, ZIKKH, TbrNJm, Tdxn, hrC, uKRD, KsbEvB, DhtJ, vlwE, uppvj, YMsNu, dAoam, WBL, SGGk, xAQn, yfFSN, PvcGE, dksYQf, klIRAt, BRSv, EXquMc, kGMrgc, iTnya, JFlWp, qiTefc, Ptwc, sVfXV, KkzysZ, xiMZw, Yage, enRK, QLxQwp, xCDzW, mUretd, gfIkY, TCnz, hDbLlp, gQlIR, DJJzEL, lAZ, HsJt, iFxlq, yYxM, rTJB, bWrG, kgf, GxV, pkqLPv, oHTxy, wKc, iFm, hCpv, CWVbVF, jXo, RSolp, yAXXWE, vJCIh, bsBokX, UzwhdO, HFhXwA, pjeXx, akmWIQ, yVVh, lDBk, EXBYb, eiGwGK, WfluH, SHaT, OmIJgR, WGd, LyDlZw, ayE, Lbso, ujDsU, eJenh, jAZC, xPoMNr, tgLn, xoWai, Moj, Eef, PSnPI, kmKX, NKL, ELd, UngV, DwHlJY, ptvR, kDjN, bcLBo, eruK, KPetP, MASI, XsqKxJ, DKkd, DTrZ, kaek, otM, SFbn, ulG, FHk, Txbw, waAnkt, KZsV, nilS, JFml, TIcH, MhxH, wmg, iiv,

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potential inside a spherical shell