Question

The metal plate on the left in figure 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 central plate is initially neutral

• A. zero
• B. $-q$
• C. $+q$
• D. $+2q$

Answer 1

The correct option is C $+q$

In steady state the following charges will appear on different faces of the plates.
Net charge on central plate is $+q$.