The radii of two metallic spheres are $5 \mathrm{cm}$ and $10 \mathrm{cm}$ and both carry an equal charge of $75 \mathrm{\mu C}$. If the two spheres are shorted, then,

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

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

In the following figure, the effective capacity between the points $P$ and $Q$ will be,

Ten identical capacitors are connected as shown. The capacitance of each capacitor is $30 \mathrm{\mu F}$. Find the equivalent capacitance between $A$ and $B$.