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Question

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 is  :

A

B

C

D

Medium

Solution

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Correct option is
D

Let charge on C be q'.
(earthed) 


Therefore,

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