Calculate the charge on the second capacitor before and after the switch in the circuit is closed.

$A$ parallel plate capacitor of capacity $100 \mu F$ is charged by a battery of $50 \text{ V}$. The battery remains connected and if the plates of the capacitor are separated so that the distance between them becomes double the original distance,the additional energy given by the battery to the capacitor in joules is

$512$ identical drops of mercury are charged to a potential of $2 \ V$ each. The drops are joined to form a single drop. The potential of this drop is ......... $V.$

Five similar condenser plates,each of area $A$,are placed at equal distance $d$ apart and are connected to a source of $e.m.f.$ $V$ as shown in the diagram. The charge on the plates $1$ and $4$ will be:

Two positive charges of magnitude $q$ are placed at the ends of one side of a square of side $2a$. Two negative charges of the same magnitude are kept at the other two corners. Starting from rest,if a charge $Q$ moves from the midpoint of the side with positive charges to the centre of the square,its kinetic energy at the centre of the square is

Find the charge stored on the capacitor in the steady-state condition in $\mu C$.