A short bar magnet placed with its axis at \(30°\)to a uniform magnetic field of 0.2T experiences a torque of 0.06Nm.
(i) Calculate magnetic moment of the magnet and 
(ii) Find out what orientation of the magnet corresponds to a stable equilibrium in the magnetic field.

An iron sample having mass 8.4 kg is repeatedly taken over cycles of magnetisation and demagnetization at a frequency of 50Hz.It is found that energy of 3.2 J is dissipated as heat in the sample in 30 minutes. If the density of iron is \(7200kg{ m }^{ -3 }\) calculate the value of energy dissipated per unit volume per cycle in the iron sample. 

To increase the current sensitivity of a moving coil galvanometer by 50%, its resistance is increased so that the new resistance becomes twice its initial resistance. By what factor does its voltage sensitivity change?

A galvanometer having 30 divisions has a current sensitivity of \(20\mu \)A per division. It has a resistance of \(25\Omega \). How will you convert it into an ammeter measuring upto I A? How will you convert in this ammeter into a voltmeter reading upto 1 V?

Relative permeability of a material, \(\mu\)_r = 0.5. Identify the nature of the magnetic material and write its relation to magnetic susceptibility.