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Q.

A short bar magnet placed with its axis at 30o with a uniform external magnetic field of 0.16 T experiences a torque of magnitude 0.032 Nm. The magnetic moment of the bar magnet will be

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a

0.23 J/T

b

0.40 J/T

c

0.80 J/T

d

Zero

answer is B.

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Detailed Solution

τ= MB sinθ  0.032 = M x 0.16 x sin30o

M=0.4 J/T

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