Find the magnitude of the magnetization in a material for which

(a) The magnetic flux density is 0.02 Wb/m²;

(b) The magnetic field intensity is 1200 A/m and the relative permeability is 1.005;

(c) There are 7.2 × 10²⁸ atoms per cubic meter, each having a dipole moment of 4 × 10₋₃₀ A·m² in the same direction, and the magnetic susceptibility is 0.003.