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The metal plate on the left in Fig, carr...

The metal plate on the left in Fig, carries a charge `+q`. The metal plate on the right has a charge of `-2q`. What charge will flow through `S` when it is closed if the central plate is initially neutral ?

A

zero

B

`-q`

C

`+q`

D

`-2q`

Text Solution

Verified by Experts

The correct Answer is:
C
In Fig, `-q` charge is induced on left face and `+2q` charge is induced on right face of central plate. Therefore, when switch `S` is closed, charge that flows through `S` to earth `= (+2q - q) = +q`.
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