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Q.
Two magnets of equal magnetic moments $M$ each are placed as shown in figure. The resultant magnetic moment is
Magnetism and Matter
Solution:
As, magnetic moments are directed along $S N$, angle between $M$ and $M$ is $\theta=120^{\circ}$.
$\therefore $ Resultant magnetic moment
$=\sqrt{M^{2}+M^{2}+2 M \cos 120^{\circ}}$
$=\sqrt{M^{2}+ M^{2}+2 M^{2}(-1 / 2)}=M$
