If $\text{'}n\text{'}$ identical water drops assumed spherical each charged to potential energy $U$ coalesce to a single drop, the potential energy of the single drop is (Assume that drops are uniformly charged):

A family of equipotential surfaces are shown. The direction of the electric field at point $A$ is along -

Some equipotential surfaces are shown in the figure. The magnitude and direction of the electric field is-

The variation of potential with distance $r$ from a fixed point is shown in the figure. The electric field at $r=5 \mathrm{cm},$ is:

Figure shows three points $A, B$ and $C$ in a region of uniform electric field $\overrightarrow{E}.$ The line $AB$ is perpendicular and $BC$ is parallel to the field lines. Then which of the following holds good?