Q.

A bar magnet of magnetic moment 200A m2 is suspended in a magnetic field of intensity 0.25 N/A-m. The couple required to deflect it through 30o is

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a

50 Nm

b

25 Nm

c

20 Nm

d

15 Nm

answer is B.

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Detailed Solution

τ=MB sin θτ=200 x 0.25 x sin30o=25 Nm
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A bar magnet of magnetic moment 200A m2 is suspended in a magnetic field of intensity 0.25 N/A-m. The couple required to deflect it through 30o is