Obtain the formula, I = k θ for a moving coil galvanometer, given, the deflecting torque where m is the magnetic dipole moment of the coil placed in the magnetic field B, I is the current in the galvanometer and θ is the deflection.
(i) Define the terms magnetization (M) and magnetic susceptibility (xm).
(ii) What is the value of the magnetic susceptibility of aluminium if its relative permeability is 1.000022 ?