A uniform magnetic field of strength is applied to three identical rods A, B and C

PHYSICS · Single correct · CBSE · Physics · Magnetism and Matter · Magnetism and Matter

Problem

A uniform magnetic field of strength H=800 A m−1H = 800\,\text{A\,m}^{-1} is applied to three identical rods A, B and C. They acquire magnetisations MA=0.008 A m−1M_A = 0.008\,\text{A\,m}^{-1}, MB=400 A m−1M_B = 400\,\text{A\,m}^{-1} and MC=−0.005 A m−1M_C = -0.005\,\text{A\,m}^{-1} respectively. After the field is switched off, rod B retains a magnetisation of 150 A m−1150\,\text{A\,m}^{-1} while A and C show no residual magnetisation. Which option correctly identifies the nature of the three materials? (a) A – Diamagnetic, B – Paramagnetic, C – Ferromagnetic (b) A – Ferromagnetic, B – Diamagnetic, C – Paramagnetic (c) A – Paramagnetic, B – Ferromagnetic, C – Diamagnetic (d) A – Paramagnetic, B – Diamagnetic, C – Ferromagnetic

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