First slide

Magnetism

Question

Three identical bar magnets, each of magnetic moment M, are placed in the form of an equilateral triangle with north pole of one touching the south pole of the other. The net magnetic moment of the system is

Moderate

A

Zero
B

3M
C

$\frac{3 M}{2}$
D

$M \sqrt{3}$

Solution

All the magnetic moment vectors can be represented both in magnitude and direction by the three sides of a triangle taken in the same order.
Using triangle law of vector addition , we can say due to symmetric system its total magnetic moment is 0.

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