There are four concentric shells , ,

PHYSICS · Single correct · AP · Physics C: Electricity and Magnetism · Conductors and Capacitors · Conductors and Capacitors

Problem

There are four concentric shells

A

B

C

, and

D

of radii

a

2a

3a

, and

4a

, respectively. Shells

B

and

D

are given charges

+q

and

-q

, respectively. Shell

C

is now earthed. The potential difference

V_A-V_C

is, where

k=\frac{1}{4\pi\varepsilon_0}

, (a)

\frac{kq}{2a}

(b)

\frac{kq}{3a}

(c)

\frac{kq}{4a}

(d)

\frac{kq}{6a}