An electric dipole with dipole moment $2 \times 10^{-10} \mathrm{Cm}$ is aligned at an angle $30^{\circ}$ with the direction of uniform electric field of $10^4 \mathrm{NC}^{-1}$. The magnitude of the torque acting on the dipole is

An electric charge $10^{-3} \mu \mathrm{C}$ is placed at the origin of $x y$-plane. The potential difference between point $A$ and $B$ located at $(\sqrt{2} \mathrm{~m}, \sqrt{2} \mathrm{~m})$ and $(2 \mathrm{~m}, 0 \mathrm{~m})$ respectively is

If two particles $A$ and $B$ of charges $1.6 \times 10^{-19} \mathrm{C}$ and $3.2 \times 10^{-19} \mathrm{C}$ respectively are separated by a distance of 3 cm in air, then the magnitude of electrostatic force on particle $A$ due to particle $B$ is

If four charges $+12 \mathrm{nC},-20 \mathrm{nC},+32 \mathrm{nC}$ and -15 nC are arranged at the four vertices of a square of side $\sqrt{2} \mathrm{~m}$, then the net electric potential at the centre of the square due to these four charges is