Questions

Three identical bar magnets each of magnetic moment M are placed in the form of an equilateral triangle as shown

The net magnetic moment of the system is

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a

Zero

b

2M

c

M3

d

3M2

detailed solution

Correct option is B

The resultant magnetic moment can be calculated as follows.Mnet=2Mcos60o+M=2M

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A bar magnet of magnetic moment $3.0{\mathrm{Am}}^{2}$ is placed in a uniform magnetic induction field of $2\mathrm{x}{10}^{-5}\mathrm{T}$. If each pole of the magnet experiences a force of $6\mathrm{x}{10}^{-4}\mathrm{N}$. The length of the magnet is

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