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

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

What happens when an electric dipole is held in a non-uniform electric field?

What should be orientation of a magnetic dipole in a uniform magnetic field so that its potential energy is maximum?

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.