Two magnetic dipoles are illustrated below If the dipole of

Two magnetic dipoles are illustrated below. If the dipole of moment mu_2 is fixed and the dipole of moment mu_2 is free to rotate, what is the most likely direction of mu_1 after a long time?

Solution

OPTION B is correct. Dipole moment is not alligned to the electric field, but the torque acting on the dipole will try to allign it with electric field. To rotate the dipole away from the allignment external torque must be applied, which is stored in the form of the potential energy and can be converted into the other forms of energy, The potential energy is low when the dipole is alligned to the electric field and will be maximum when it is anti alligned. Therefore, the position of dipole 1 will be like shown in the option B