Questions
An uncharged metallic sphere A of radius R is concentrically placed inside another sphere. Then metallic spherical shell of radius 2R carrying a charge Q. Now the sphere A is earthed. If P be a point at a radial distance 1.5 R from the centre of the spheres, then potential at P is
detailed solution
Correct option is B
Let q be the charge on sphere A. since potential of A is zero,K.qR+K.Q2R=0⇒q=-Q2. ∴VP=K.q1.5R+K.Q2R=14πε0-Q23R2+14πε0Q2R=Q24πε0RTalk to our academic expert!
Similar Questions
Two spherical shells are as shown in figure.
Let r be the distance of a point from their common centre. Then, match the following columns and mark the correct choice from the given codes.
| Column-I | Column-II | ||
| i. | Electric field for r < R1 | p. | is constant for q2 and vary for q1 |
| ii. | Electric potential for r < R1 | q. | is zero for q2 and vary for q1 |
| iii. | Electric potential for R1 < r <R2 | r. | is constant |
| iv. | Electric field for R1 < r <R2 | s. | is zero |
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