Find the magnetization M in a magnetic material where: (a) = 1.8 x 10 -5 H/m and H = 120 A/m; (b) r =

Find the magnetization M in a magnetic material where: 

(a) μ = 1.8 x 10^-5 H/m and H = 120 A/m; 

(b) μr = 22, there are 8.3 x 10²⁸ atoms/m³, and each atom has a dipole moment of 4.5 x 10^-27 A·m²; 

(c) B = 300 μT and χm = 15.