Q. A rod of ferromagnetic material with dimensions 10 cm × 5 cm × 2 cm is placed in a magnetising field of intensity 2 × 10^{-5} A/m. The magnetic moment produced due it is 6 amp – m². The value of magnetic induction will be …….10^{-2}T.

(a) 100.48

(b) 200.28

(c) 50.24

(d) 300.48

Ans:(a)

Sol: V = 100 × 10^{-6} m^{3}

H = 2 × 10^{-5} A/m

M = 6 amp – m²

$ \displaystyle I = \frac{M}{V} $

$ \displaystyle B = \mu_0 (H + I)$