The uniform electric field in the space between the plates of a parallel plate condenser of plate separation $d$ and plate areas $A$ is $E.$ The energy of this charged condenser is:

In the given circuit with steady current, the potential drop across the capacitor must be,

In the adjoining circuit, the capacity between the points $A$ and $B$ will be -

The resultant capacity between the points $A$ and$B$ in the adjoining circuit will be, 

The effective capacity in the following figure between the points $P$ and $Q$ will be -

The charge on the condenser of capacitance $2 \mu \mathrm{F}$ in the following circuit will be -

Five capacitors of $10 \mathrm{\mu F}$ capacity each are connected to a $\mathrm{D}.\mathrm{C}.$ potential difference of $100 \mathrm{V}$ as shown in the figure. The equivalent capacitance between the points $A$ and $B$ will be equal to-

The equivalent capacitance between the terminals $X$ and $Y$ in the figure shown will be-