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Q. Match the columns I and II.
Column I Column II
A Axial field for a short dipole 1 -M.B
B Equatorial field for a short dipole 2 $M \times B$
C External field torque 3 $\mu_0 2 M / 4 \pi \pi^3$
D External field energy 4 $-\mu_0 M / 4 \pi r ^3$

Magnetism and Matter

Solution:

$( A ) \rightarrow 3 ;( B ) \rightarrow 4 ;( C ) \rightarrow 2 ; (D) \rightarrow 1$