Five conducting parallel plates having area $A$ and separation between them $d$, are placed  as shown in the figure . Plate number $2$ and $4$ are connected wire and between  point $A$ and $B$, a cell of emf $E$ is connected . The charge flown through the cell is :-

Charge of $2Q$ and $-Q$ are placed on two plates of a parallel plate capacitor if capacitance of capacitor is $C$ find potential difference between the plates

Two condensers, one of capacity $C$ and the other of capacity $\frac{C}{2}$ , are connected to a $V\, volt$ battery, as shown. The work done in charging fully both the condensers is

 An insulator plate is passed between the plates of a capacitor. The the displacement current

Consider the situation shown. The switch $S$ is opened for a long time and then closed. The charge flown through the battery when $S$ is closed