A variable capacitor has $n$ plates and the distance $r$ between two successive plates is $d$. Determine its capacitance.

A network of four capacitors each of $12\mathrm{ }\mathrm{\mu F}$ capacitance is connected to a $500\mathrm{ }\mathrm{V}$ supply as shown in Figure. Determine equivalent capacitance of the network.

A network of four capacitors each of $12\mathrm{ }\mathrm{\mu F}$ capacitance is connected to a $500\mathrm{ }\mathrm{V}$ supply as shown in Figure. Determine charge on each capacitor.

For the network shown in Figure, compute

The equivalent capacitance between points $a$ and $b$ .

For the network shown in Figure, compute

The charge on each of the capacitors nearest to $a$ and $b$ when $V_{ab}=900 \mathrm{V}$.

For the network shown in Figure, compute

$V_{cd},$ when $V_{ab}=900 \mathrm{V}$

Three capacitors of capacitances  $10 \mathrm{\mu F},$  $20 \mathrm{\mu F}$  and $30 \mathrm{\mu F}$ are connected in parallel to a $100 \mathrm{V}$ battery as shown in Figure. Calculate the energy stored in the capacitors.

How many electrons must be added to one plate and removed from the other so as to store $25.0 J$ of energy in a $5.0 nF$ parallel plate capacitor?