Four very large metal plates are given charges as shown in figure. The middle two are then connected through a wire. Find the charge that will flow through the wire.

Options

A. `5Q` from `A` to `B`
B. `5Q//2` from `A` to `B`
C. `5Q` from `B` to `A`
D. no chrage will flow

Answer

A

Explanation

Distribution of charge before the wire is connected is shown in figure.
On connecting with wire `5Q` and `-5Q` will get neutralize. Hence `5Q` charge will flow from `A` to B`.