An electron of charge $e$ coulomb passes through a potential difference of $V$ volts. Its energy in joules will be

Twenty-seven drops of water of the same size are equally and similarly charged. They are then united to form a bigger drop. By what factor will the electrical potential change?

$A$ conductor with a positive charge:

The electric potential of the Earth is taken to be zero because the Earth is a good:

$A$ metal sphere of radius $R$ carrying charge $q$ is surrounded by a thick concentric metal shell of inner and outer radii $a$ and $b$ respectively. The net charge on the shell is zero. The potential at the centre of the sphere, when the outer surface of the shell is grounded, will be

The dimensions of electric potential are