Question

Two Magnets of equal magnetic moments M each are placed as shown in figure. The resultant magnetic moment is

• A. $M$
• B. $\sqrt{3}M$
• C. $\sqrt{2}M$
• D. $\frac{M}{2}$

Answer 1

The correct option is A $M$

As magnetic moments are directed along $SN$,

so, angle between $M$ and $M$ is $\theta ={120}^o$ (from given figure)

$\therefore$ Resultant magnetic field $=\sqrt{M^2+M^2+2MM\cos {120}^o}=M$