Physics

Problem

A uniform magnetic field of strength

H = 800\,\text{A\,m}^{-1}

is applied to three identical rods A, B and C. They acquire magnetisations

M_A = 0.008\,\text{A\,m}^{-1}

M_B = 400\,\text{A\,m}^{-1}

and

M_C = -0.005\,\text{A\,m}^{-1}

respectively. After the field is switched off, rod B retains a magnetisation of

150\,\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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