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Physics Question on Moving charges and magnetism

Three identical bar magnets each of magnetic moment M are arranged in the form of an equilateral triangle such that at two vertices like poles are in contact. The resultant magnetic moment will be

A

Zero

B

2M

C

2 M\sqrt2\,M

D

M3M\sqrt3

Answer

2M

Explanation

Solution

Mres=(3M)2+M2M_{res} = \sqrt{(\sqrt{3} M)^2+ M^2}