The sphere has a charge of 24. What is. The situation is symmetric, so the charge is distributed uniformly. Homework Statement Two concentric conducting spherical shells produce a radially outward electric field of magnitude 49,000 NC at a point 4. The spherical s ladyb6811 ladyb6811 02072020 Physics. This charge induces a charge distribution on the surrounding. 250 m has a very small charged sphere suspended in its center. A conducting spherical shell having inner radius a and outer radius b carries a net charge Q. A spherical conducting shell of inner radius a and outer radius b carries a total charge Q distributed on the surface of a conducting shell (Fig. Electric field due to a uniformly charged thin spherical shell. 0 cm, has charge spread nonuniformly through its volume between its inner and outer surfaces. (d) What is the magnitude of the electric field at radial distance r. At the center of the Doubtnut 2. Concentric with it is a conducting spherical shell of inner radius R1 and outer radius R2. Amazing illustrations. A charge &x27;q&x27; is placed at the centre of the shell. 2 times r 1. Conducting Spherical Shells Example A conducting sphere of radius R 1 carries a net charge Q 1. Find the capacitance of the spherical capacitor. (a) The charge of magnitude q present inside the spherical shell induces a charge of magnitude q 0n the inner part of the shell. The radius of the inner cylindrical shell is 2. (i) A charge q is placed at the . Question (25) Problem 2 A conducting spherical shell of inner radius R1 and outer radius R2 has a point charge q fixed at its center. 75 &181;C, 44 &181;C, and 50 &181;C, respectively. 0 cm. A spherical conducting shell of inner radius r(1) and outer radius r(2) has a charge Q. Edit Added Wed, 16 Dec &x27;15. What is the surface charge density on the inner and outer surfaces of the shell ii) Is the electric field inside a cavity (with no charge) zero, even if the shell is not spherical, but has any irregular shape Explain. A charge of q is placed at the centre of the shell. See below. A conducting spherical shell having inner radius (a) and outer radius (b) carries a net charge (Q). VIDEO ANSWER gases all can be used to determine the electric field for very symmetric uh objects such as fears. 7K views 2 years ago A solid spherical conducting shell. Consider a sphere with radius r between the two spheres and concentric with them as Gaussian surface. What is the magnitude of the electric field at a distance r 12 cm from the center of the shell (k 140 8. hilw The electric. 8 cm is concentric with a spherical conducting shell of inner radius b 37. However if you make the shell infinitely thin (which is again not possible physically,) then the potential inside (for radii less than the radius of the shell) would be still a constant. In Figure, a solid sphere of radius a 2. 100 m and b. If a point charge q is placed at the centre of this shell, then. A spherical conducting shell of inner radius r1 and outer radius R2 has a charge Q. A spherical conducting shell of inner radius r 1 and outer radius r 2 has a charge Q. The shell carries a net charge of negative 3 pc a)What is the field at 3 cm from the center NC b)What is the field at 6 cm NC c)What is the field at 12 cm. Each shell must be full before the next starts to fill. The charge of the spherical shell is Q. 00 &215; 10- 8 C and that on the outer shell is 2. Expert Answer. A hollow non-conducting spherical shell has inner radius R1 8 cm and outer radius R2 16 cm. A larger concentric conducting spherical shell has charge Q and radius R2. Problem 46 in this problem, we have given a spherical shell with inner radius and outer radius b. Because the biotite diffusion coefficients are not too different from the zircon To keep the mathematics tractable, we will assume spherical symmetry, with a sphere of zircon of effective radius a inside a spherical shell of material. are shown in the figure above. The electric field due to charge Q in three different regions I, II and III is given by (Ir < a, II a < r < b, III r > b) 3 1 JEE Main JEE Main 2023 Report Error A E I 0,E II 0,E III 0 B. are shown in the figure above. A charge of q1 0. 40 10-3 m, and that of the outer shell is 2. What is the magnitude of the electric field at distances of a. Click hereto get an answer to your question A spherical shell with an inner radius 'a' and an outer radius 'b' is made of conducting material. A spherical conducting shell of inner radius r1 and outer radius R2 has a charge Q. A and B are two conducting concentric spherical shells. The net charge on the shell is 3Q. The Distance r Is Measured From The Centre Of The Shells. Seashells are made when marine mollusks such as snails, clams and oysters secrete minerals and proteins through their mantle, which is the outermost part of their body that comes in contact with the shells. What is the surface charge density on the inner and outer surfaces of the shell (b) Is the electric field inside a cavity (with no charge) zero, even if the . UE, where. A conducting spherical shell having inner radius (a) and outer radius (b) carries a net charge (Q). Since all the spheres and shell s in this situation are conducting, any excess charge must reside on the surface. The situation is symmetric, so the charge is distributed uniformly. Optics Field of Charged Spherical Shell Task number 1531 A spherical shell with inner radius a and outer radius b is uniformly charged with a charge density . The inner shell has a net charge of 3q and the outer shell has a net charge of 4q. 1 40 q 3R 1 4 0 q 3 R. A spherical conducting shell of inner radius r1 and outer radius R2 has a charge Q. What is the surface charge density on the. A hollow, conducting spherical shell of inner radius R 1 and outer radius R 2 encloses a charge q inside, which is located at a distance d (< R 1) from the centre of the spheres. A small conducting spherical shell with inner radius a and outer radius b is concentric with a larger conducting spherical shell with inner radius c and outer radius d. Calculate the electric field in terms of q and the distance r from the common centre of the two shells for. are shown in the figure above. a) Drawa sketch of the distribution of charge in the conductor and the electric field lines. 7 pF d) 46. 50 C and q2 2. For all parts below, answer in terms of q, a, b, and fundamental constants. VIDEO ANSWER gases all can be used to determine the electric field for very symmetric uh objects such as fears. two charged conducting spheres of radii r1 and r2ups contractor opportunities. Electric field due to a uniformly charged thin spherical shell. Standard Mode Category, Eddington luminosity, Eddington accretion rate, Angular momentum, Event horizon radius, ISCO radius, Photon sphere radius, Bondi radius. For R1 < r < R2 The charge enclosed will be Q1, and the electric field can be determined either from using a concentric spherical Gaussian surface with radius r in this region, or simply noting that the field will be the same as if all the charge were located at the origin. We would like to know the e field at a distance of 3. The shell has an unknown charge. A conducting spherical shell of inner radius 2R 2 R and outer radius 3R 3 R has a positive point charge q q located at its centre. A solid spherical conducting shell has inner radius a and outer radius 2a. This charge induces a charge distribution on the surrounding spherical shell, polarizing it; call Q. What is the surface charge density on the inner and outer surfaces of the shell (b) Is the electric field inside a cavity (with no charge) zero, even if the shell is not spherical, but has any irregular shape. A spherical conducting shell of inner radius r1 and outer radius r2 has a charge Q. (a) A charge q is placed at the centre of the shell. A spherical conducting shell of inner radius a and outer radius b carries a total charge Q distributed on the surface of a conducting shell (Fig. (a) (25 points) Use Gauss&x27;s Law to find the electric field for all r. A point charge q is released from rest at r c. For a spherical Gaussian surface within the shell, radius r, Gauss&39; law indicates that. 10 m from the center of the shells. (a) A charge q is placed at the center of the shell. Find an answer to your question A conducting spherical shell of inner radius R1 and outer radius R2 has a point charge q located at its center. hilw The electric. Now we place a point charge q 1mC at its center. If there is another the centre O of an uncharged hollow spherical conductor of inner radius p and outer radius q. A spherical conducting shell of inner radius r 1 and outer radius r 2 has a charge Q. 3 cm and outer radius r2 15. is the distance from the center of the sphere. i) A charge q is placed at the centre of the shell. A conducting spherical shell with inner radius a and outer radius b has a positive point charge Q located at its center. b a. What is the surface charge density on the. A conducting spherical shell of Inner radius 5 cm and outer radius 10 cm, surrounds a charge of 55. 99 10 9 N m 2 C 2. 200 m and an outer radius of 0. A charge q is placed at the centre of the shell. 200 m has a very small charged sphere suspended in its center. The closest shell has a value of n1. A point charge q is released from rest at r c. Transcribed Image Text. 40 cm has (within its thickness) a positive volume charge density Ar,. An insulator in the shape of a spherical shell is shown in cross-section above. Consider two concentric spherical shell. The potential at the centre is. Two concentric spherical shells have masses M 1, M 2 and radii R 1, R 2 (R 1 < R 2). There is a net charge q2 3. A conducting spherical shell having inner radius (a) and outer radius (b) carries a net charge (Q). A spherical conducting shell of inner radius r and outer radius r has a charge Q. distributed on the surface of a conducting shell as in figure. Question From - NCERT Physics Class 12 Chapter 02 Question 015 ELECTROSTATIC POTENTIAL AND CAPACITANCE CBSE, RBSE, UP, MP, BIHAR BOARD QUESTION TEXT- A spherical conducting shell of inner. 520 m and R2 1. 6 mC. Find the capacitance of the spherical capacitor. Find the polarization surface charge densities on two surfaces of the dielectric shell. 200 m and an outer radius of 0. a spherical conducting shell of inner radius r 1 a. The inner shell has a total charge of 2q and the outer shell has a total charge of 4q Select True or False for the following statements. The electric field just above the surface of the conductor is directed radially outward and has magnitude 7. shell has a total a Select True or False for the following statements. The potential at infinity is taken to be zero. The insulating sphere at the center has a charge Q uniformly distributed over it, and has a radius R. However if you make the shell infinitely thin (which is again not possible physically,) then the potential inside (for radii less than the radius of the shell) would be still a constant. 64K subscribers Exercise. A is given a charge Q while B is. Optics Field of Charged Spherical Shell Task number 1531 A spherical shell with inner radius a and outer radius b is uniformly charged with a charge density . A grounded, conducting, spherical shell of inner radius b > d is centered at the midpoint of the line charge. Consider a thin shell of radius R which has total surface charge Q. Question From - NCERT Physics Class 12 Chapter 02 Question 015 ELECTROSTATIC POTENTIAL AND CAPACITANCE CBSE, RBSE, UP, MP, BIHAR BOARD QUESTION TEXT- A spherical conducting shell of inner. ) 68. Electric Field due to Infinitely Charged Wire. As shown in Figure 21-20, a conducting spherical shell has an inner radius R1 and an outer radius R2. The net charge on the shell is 3Q. Two Concentric Spherical Shells of Uniform Density And Having Masses latex M1 latex and latex M2 latex Are Situated As Shown In The Figure. This page describes how to generate various spherical geometries using C and how to draw them with OpenGL. 10522 Cm2 Find the total charge on each surface. A non-conducting spherical shell of inner radius a 1 a 1 and outer radius b 1 b 1 is uniformly charged with charged density 1 1 inside another non-conducting spherical shell of inner radius a 2 a 2 and outer radius b 2 b 2 that is also uniformly charged with charge density 2 2. 0 cm, has charge spread nonuniformly through its volume between its inner and outer surfaces. and outer radius. Step-by-Step Verified Solution. is a positive constant and. The capacitance of this arrangement is approximately a) 22. For a spherical Gaussian surface within the shell, radius r, Gauss&39; law indicates that. a A charge q is placed at the centre of the shell. Q2 Positive charge Q 200C is placed on a conducting spherical shell with inner radius. tasty food co chicken tenders porterfield funeral home obituaries; fletching money making rs3. 22 (a). The solid sphere has total charge 2q distributed uniformly over the entire volume, and the spherical shell has charge 3q. Take the zero of electric potential to be at some point at infinity. This thick shell is neutral. There is a small tunnel in the body of. Aug 27, 2015 &183; A single point charge q18uc is the center Smaller spherical shell is non-conductive with R110cm, R220 cm and charge density of 80ucm3. 1) Find the electric field intensity at a distance z from the centre of the shell. Problem 46 in this problem, we have given a spherical shell with inner radius and outer radius b. There is a net charge q2 3. 00 cm is concentric with the solid sphere and has a charge of -3. A thin spherical shell with radius R1 3. The surface charge density on the inner and outer. Figure 2. For all parts below, answer in terms of q, a, b, and fundamental constants. R2 taq 4 33 Part (a) Enter an expression for the surface charge density on the inner surface of the spherical shell, using the variables provided. A conducting spherical shell with inner radius a and outer radius b has a positive point charge Q located at its center. 3 cm. 55f f; the shell has a net charge q2 q1. The total charge on the shell is -3Q, and it is insulated from its surroundings. This charge induces a charge distribution on the surrounding. What is the surface charge density on the inner and outer surfaces of the shell (b) Is the electric field inside a cavity (with no charge) zero, even if the . b a. a) Drawa sketch of the distribution of charge in the conductor and the electric field lines. A spherical conducting shell of inner radius r1 and outer radius r2 has a charge Q. F18F2 A point charge is placed at the center of an uncharged, spherical , conducting shell of radius R. can a game warden enter private property in va > www mugshots com arizona > two charged conducting spheres of radii r1 and r2. Three concentric conducting spherical shells have inner and outer radii of 0. Determine the following. A spherical conducting shell with a radius of 0. A conducting spherical shell of inner radius a and outer radius b carries a net charge Q. If you are talking of a conducting sphere, this situation cannot happen physically. Figure 2. An aspherical conducting shell of inner radius r 1 and outer radius r 2 has a charge Q. 17K subscribers A spherical conducting shell of inner radius r1 and outer radius R2 has a charge Q. What is the surface charge density on the inner and outer surfaces of the shell. What is the electric field as a function of r. The inner shell has a total charge of -2q and the outer charge of 3q. What is the force exerted by this system on a particle of mass m 1 if it is placed at a distance (R 1 R 2)2 from the centre. A is given a charge Q while B is. two conducting spheres of radii r1 and r2 have charge q1 and q2 respectively. An aspherical conducting shell of inner radius r 1 and outer radius r 2 has a charge Q. The inner shell has a total charge of -2q and the outer charge of 3q. If a point charge (q) is placed at the ce. (a) A charge q is placed at the centre of the shell. All these physical parameters of spheres and monolayers are collected in Table I. 0 cm and 15. What is. Optics Field of Charged Spherical Shell Task number 1531 A spherical shell with inner radius a and outer radius b is uniformly charged with a charge density . If you are talking of a conducting sphere, this situation cannot happen physically. The surface charge dens. A conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere and carries a net charge -2Q. Question From - NCERT Physics Class 12 Chapter 02 Question 015 ELECTROSTATIC POTENTIAL AND CAPACITANCE CBSE, RBSE, UP, MP, BIHAR BOARD QUESTION TEXT- A spherical conducting shell of inner. 2 cm from the center of the shell (0 8. The surface charge density on the inner and outer surfaces of the shell will be (a) q, and 2 (b) I and 29 4Tr 4rtr 4nr 4tr () are and () O and Sera O and. A small insulating solid sphere with radius a is concentric with a larger conducting spherical shell with inner radius b and outer radius c. A spherical conducting shell of inner radius and outer radius has a charge (a) A charge is placed at the center of the shell. (a) A charge q is placed at the center of the shell. This charge induces a charge distribution on the surrounding spherical shell, polarizing it; call Q 2and Q 3the charges induced on the surfaces at rR 2and rR 3, respectively. 4 0 a. 1) Find the electric field intensity at a distance z from the centre of the shell. 6 mC, and the conducting shell has a net charge of 24. When a sphere is falling through a fluid it is completely submerged, so there is only one volume to talk about the volume of a sphere. tasty food co chicken tenders porterfield funeral home obituaries; fletching money making rs3. If an in nitely-long cylindrical hole of radius a By Gauss' law, the charge contained in this cylinder is r&178;, because the cylinder intersects the plane in a circle of radius r, so we take the area of the circle times the surface charge density Capacitance of a sphere is Draw a Gaussian surface in the form of a cylinder. 0010-6 C. A conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere and carries a net charge -2Q. 5M subscribers 1. If you are talking of a conducting sphere, this situation cannot happen physically. Physics questions and answers. A Conducting Spherical Shell. Charge is supposed to stay on the outer surface of the conducting shell. The electric field due to charge Q in three different regions I, II and III is given by (Ir < a, II a < r < b, III r > b) 3 1 JEE Main JEE Main 2023 Report Error A E I 0,E II 0,E III 0 B. mp3 - Shown in the figure a spherical shell with an inner radius a and an outer radius b is m . Class 12 >> Physics. 00 cm and outer radius 5. What is the surface charge density on the inner a. The average shell thickness of the spheres was deduced from the known values of density of glassy carbon, weight and number of spheres in the monolayer, and average sphere diameter. videos pornosde travestis, slime fun wool to string
7 nC is added to the conducting shell. . A spherical conducting shell of inner radius
The sphere is then enclosed by a spherical dielectric shell of r r, with inner radius b and outer radius c, as shown in Fig. A small insulating solid sphere with radius A is concentric with a larger conducting spherical shell with inner radius B and outer radius C. A spherical conducting shell of inner radius a and outer radius b carries a total charge Q distributed on the surface of a conducting shell as in figure. The situation is symmetric, so the charge is distributed uniformly. What is the surface charge density on the. Find an expression for r in terms of x. A spherical, conducting shell of inner radius r1 10 cm and outer radius r2 15 cm carries a total charge Q 15 C. What is the magnitude of the electric field at a distance r 12 cm from the center of the shell (k 14 0 8. A spherical conducting shell of inner radius r and outer radius r has a charge Q. The surface charge density on the inner and outer. What is the surface charge density on the inner and outer surfaces of the shell (b) Is the electric field inside a cavity (with no charge) zero, even if the shell is not spherical, but has any irregular shape. are shown in the figure above. 301358 Cm2. In the case of thin walled pressure vessels of spherical shape the ratio of radius r to wall thickness t is greater than 10. A thick spherical conducting shell with an inner radius of 0. Your answers should be in terms of , R1, R2, r, 0, and . tasty food co chicken tenders porterfield funeral home obituaries; fletching money making rs3. So looking at this, this radius, righty is our A and the outer radius. (a) Using Gauss's law, find the electric field (i) for r <a and. What is. Apr 8, 2016 If you are talking of a conducting sphere, this situation cannot happen physically. 99 109 N 3D 3D m2C2). A is given a charge Q while B is. An Illustration from an 1878 book on John Cleves Symmes, Jr. 00 nC distributed uniformly over its surface, and the larger shell has charge q29. The inner shell has total charge 2 q and the outer shell has charge 4 q. 40 m, uniform charges q1 2. A is given a charge Q while B is. Determine the surface charge density on (a) the inner surface of the shell and (b) the outer surface of the shell. 00 uc fixed at the center of the shell. That is represented by B. Computer dictionary definition for what shell means including related links, information, and terms. A point charge q is released from rest at r c. The spherical shell has a net charge of aq. If a point charge (q) is placed at the ce. If a point charge (q) is placed at the ce. For a spherical Gaussian surface within the shell, radius r, Gauss&39; law indicates that. 862 m and outer radius c 1. Q magnitude of charge on each sphere Electric eld between spheres use Gauss law E4pr2 Q e0)E(r) Q 4pe0r2 Electric potential between spheres use V(a) 0 V(r) Z r a E(r)dr Q 4pe 0 Z r a dr r2. The inner radius of the spherical shell is b. 5R and outer radius 2R. What is. However if you make the shell infinitely thin (which is again not possible physically,) then the potential inside (for radii less than the radius of the shell) would be still a constant. What is an expression for the electric field for 0. (a) What is the magnitude and direction of the electric field at r 1 cm (b) What is the magnitude and direction of the electric field at r 3 cm. A charge -q is placed at the centre of the shell. Figure 7. 100 m and b. Apr 8, 2016 If you are talking of a conducting sphere, this situation cannot happen physically. Spherical Capacitor Conducting sphere of radius a surrounded concentrically by conducting spherical shell of inner radius b. Homework Statement Two concentric conducting spherical shells produce a radially outward electric field of magnitude 49,000 NC at a point 4. A thick spherical conducting shell with an inner radius of 0. If you are talking of a conducting sphere, this situation cannot happen physically. 00 cm and outer radius b 2. 60 cm is concentric with a spherical conducting shell of inner radius b 2. 00 cm. Most of you are already familiar with this operator, and actually it&x27;s quite easy to explain. Since we cannot draw all the points on a sphere, we only sample a limited amount of points by dividing the sphere by sectors (longitude) and stacks (latitude). A conducting spherical shell of inner radius a 26. Apr 8, 2016 If you are talking of a conducting sphere, this situation cannot happen physically. The inner shell has total charge 2 q and the outer shell has charge 4 q. 400 m and outer radius 0. Use Gauss&x27;s law to derive an equation for the magnitude of the electric field at the following radial distances r from the center of the sphere. A spherical conducting shell of inner radius r1 and outer radius r2 has a charge &39;Q&39;. The sphere has a net uniform charge q1 6. 8 cm is concentric with a spherical conducting shell of inner radius b 37. Nici mops - Die besten Nici mops analysiert Unsere Bestenliste Aug2022 Umfangreicher Produktratgeber TOP Modelle Aktuelle Schn&228;ppchen Vergleichssieger Direkt ansehen. it&x27;s inner radius is the same (or slightly larger) as the radius of the first ball, and its outer radius is Now if I print two such octahedra I would be able to push one into another, creating a spherical joint I&x27;m not sure how thick the outer spherical shell should be, and how much it should be truncated, but. We can first determine the electric field within the shell using Gauss&39; law, one of Maxwell&39;s equations. Use Gauss&x27;s law to derive an equation for the magnitude of the electric field at the following radial distances r from the center of the sphere. 4 cm and outer radius 3. 6 mC, and the conducting shell has a net charge of 24. Spherical approximation of the zircon-in-biotite system. Find the potential everywhere inside the spherical shell as an expansion in Legendre polynomials. In Figure, a solid sphere of radius a 2. Consider a charged spherical conducting shell. (25 pts) a) Use Gauss&39;s Law to find the charge on the inner and outer. 63, a non-conducting spherical shell of inner radius a 2 cm and outer radius b 2. Seashells are made when marine mollusks such as snails, clams and oysters secrete minerals and proteins through their mantle, which is the outermost part of their body that comes in contact with the shells. Inside the shell c. (c) If an additional charge of -2Q is placed at the center, find. A hollow cylindrical resistor with inner radius r1 and. 6 C is at the center of an uncharged spherical conducting shell of inner radius 65 cm and outer radius 110 cm. Three concentric conducting spherical shells have radii r,2r and 3r and charges q1,q2 and q3 respectively. 3 cm from the center of the shell (k 147TEN 8. A small conducting spherical shell with inner radius a and outer radius b is concentric with a larger conducting spherical shell with inner radius c and outer radius d (as shown in Fig). The insulating sphere at the center has a charge Q uniformly distributed over it, and has a radius R. Use Gauss&x27;s law to derive an equation for the magnitude of the electric field at the following radial distances r from the center of the sphere. A conducting spherical shell of inner radius a and outer radius b carries a net charge Q. Spherical Capacitor Conducting sphere of radius a surrounded concentrically by conducting spherical shell of inner radius b. Your preferences will apply to this website only. Question From - NCERT Physics Class 12 Chapter 02 Question 015 ELECTROSTATIC POTENTIAL AND CAPACITANCE CBSE, RBSE, UP, MP, BIHAR BOARD QUESTION TEXT- A spherical conducting shell of inner. (a) A charge q is placed at the center of the shell. A solid sphere of radius a 12. Earth, the third planet from the sun, is the fifth-largest planet in the solar system; only the gas giants Jupiter, Saturn, Uranus and Neptune are bigger. Consider a sphere with radius r between the two spheres and concentric with them as Gaussian surface. Find the polarization surface charge densities on two surfaces of the dielectric shell. kandy badu; powershell script to open excel file. (a) A charge q is placed at the center of the shell. b a. A conducting spherical shell of inner radius a 43. The sketch of the calculation is shown in Figure 3. Since we cannot draw all the points on a sphere, we only sample a limited amount of points by dividing the sphere by sectors (longitude) and stacks (latitude). Evaluate the resistance R for such a resistor made of carbon whose inner and outer radii are 1. The solid plastic sphere has a charge per unit volume given by. A solid conducting sphere of radius &39; a &39; and charge Q is concentric with a spherical conducting shell of inner radius &39; b &39; and outer radius &39; c &39;. Which of the following. 31 - see notes for further details. Publicado el 19 junio 2022 en purl increase without hole19 junio 2022 en purl increase without. Charge is supposed to stay on the outer surface of the conducting shell. A thick conducting spherical shell of inner radius a and outer radius b is shown in figure. The sphere has a charge of 24. A hollow conducting spherical shell of inner radius R1 and outer radius R2 encloses a charge q inside it. The inner shell has total charge Q and outer radius ra r a, and outer shell has charge -Q and inner radius rb r b. Two concentric spherical shell of radius R1 & R2 have q1 & q2 charge respectively. Solution For A spherical conducting shell of inner radius r1 and outer radius r2 has a charge Q. . joi hypnosis