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Three concentric spherical conducting shells A, B and C of radii a, 2a and 4a are initially given charges +Q, -2Q and +Q respectively. The charge on the middle spherical shell B after switches `S_(1)` and `S_(2)` are simultaneously closed, will be

A

`-Q`

B

`-(Q)/(2)`

C

`+Q`

D

`(+3Q)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
B

The electric potential potential of shell B is zero
`V_(B)=0`
`(kq)/(2a)+(kQ)/(4a)=0`
`thereforeq=-(Q)/(2)`
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