The electric potential at a point on the axis of an electric dipole depends on the distance $r$ of the point from the dipole as

An electric dipole is placed in an electric field generated by a point charge.

What is an electric dipole? Write its $SI$ unit.

Consider two charges $+q$ and $-q$ $(q > 0)$ placed at a distance $2a$ from each other. At the point $M$ (see figure below),the electric field makes an angle $\phi$ with the $x$-axis. The correct value of $\phi$ is (in $^{\circ}$)

When an electric dipole $\vec{p}$ is placed in a uniform electric field $\vec{E}$,for what angle (in degrees) between $\vec{p}$ and $\vec{E}$ will the torque be maximum?

Two point charges $-4 \mu C$ and $4 \mu C$,constituting an electric dipole,are placed at $(-9, 0, 0) \ cm$ and $(9, 0, 0) \ cm$ in a uniform electric field of strength $10^4 \ NC^{-1}$. The work done on the dipole in rotating it from the equilibrium position through $180^{\circ}$ is: (in $mJ$)