Write an equation of torque on dipole placed in uniform electric field.

Write the equation of torque on the needle placed in a uniform magnetic field and obtain the equation of its periodic time T = 2 pi sqrt((I)/( mB)) .

Write the equation of torque acting on bar magnet placed in uniform magnetic field.

Derive the equation of torque on a magnetic needle in a uniform magnetic field.

If electric dipole is placed in non-uniform electric field, then......

Explain polarisation of polar molecule in uniform electric field.

When the torque acting on electric dipole in uniform electric field becomes zero ?

What is the force acting on electric dipole in uniform electric field ?

An electric dipole of momentum vecp is placed in a uniform electric field. The dipole is rotated through a very small angle theta from equilibrium and is released. It executes simple harmonic motion with frequency f=1/(2pi)sqrt((pE)/I) where, I= moment of interia of the dipole.