Define non-uniform electric field.

When is an electric dipole in unstable equilibrium in an electric field ?

When is an electric dipole in stable equilibrium in an clectric field ?

A short bar magnet of magnetic moment m = 0.32 JT^(-1) is placed in a uniform magnetic field of 0.15 T. If the bar is free to rotate in the plane of the field, which'orientation would correspond to its (a) stable, and (b) unstable equilibrium ? What is the potential energy of the magnet in each case?

Calculate the amount of work done in turning an electric dipole of dipole moment 2xx10^-8 C-m from its position of unstable equilibrium of the position of stable equilibrium in a uniform electric field of intensity 10^3 NC^-1 .

A short bar magnet placed with its axis at 30^@ to a uniform magnetic field of 0.2 T experience a torque of 0.06 Nm. Find out what orientation of the magnet corrsponds to a stable equilibrium in the magnetic field?

A short bar magnet of magnetic moment 0.9 JT^-1 is placed with its axis at 45^@ to a uniform magnetic field. If it experiences a torque of 0.063 J: What orientation of the bar magnet corresponds to the stable equilibrium in the magnetic field?

Prove that the net force acting on an electric dipole, inclined at an angle theta to the uniform electric field vecE is zero. Draw a suitable diagram.

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.

Derive an expression for potential energy of an electric dipole placed in a uniform electric field. Or Derive an expression for the total work done in rotating an electric dipole through an angle theta in a uniform electric field.