First slide

The bar magnet

Question

Two magnets of moment m and 2m are tied at an angle of 60^o to each other. The magnetic moment of the combination will be

Easy

A

3 m
B

m
C

$\sqrt{5} m$
D

$\sqrt{7} m$

Solution

The magnetic moment of the combination will be
$M = \sqrt{[(m)^{2} + (2 m)^{2} + 2 m \cdot 2 mcos 60^{\circ}]} = \sqrt{7} \cdot m$

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