In which orientation,a dipole placed in a uniform electric field is in unstable equilibrium?

What orientation of an electric dipole in a uniform electric field corresponds to its stable equilibrium?

Derive the experiment for the torque acting on an electric field. Identity the orientation of the dipole in the electric field in which it attains a stable equilibrium.

When will a magnet in an external magnetic field be in unstable equilibrium?

A proton and an electron are placed in a uniform electric field . Then

Find an expression for the troque experienced by an electric dipole placed in a uniform electric field. Hence, define electric dipole moment.