When a proton is accelerated through a potential difference of $1 \, V$, its kinetic energy is .......... $eV$.

$A$ charge $Q$ is uniformly distributed over a rod $AB$ of length $L$ as shown in the figure. The electric potential at point $O$,which is at a distance $L$ from end $A$,is:

An electron is accelerated through a potential difference of $2.5 \ V$. The energy gained by the electron is . . . . . . . (Charge of an electron = $1.6 \times 10^{-19} \ C$)

Two concentric hollow spherical shells have radii $r$ and $R$ $(R \gg r)$. $A$ charge $Q$ is distributed on them such that the surface charge densities are equal. The electric potential at the centre is

Explain electrostatic potential energy difference and give the noteworthy comments on it.

The electrostatic potential energy of the given system of charges placed at the corners of a square of side $a$ is: