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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

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a
50 Nm
b
25 Nm
c
20 Nm
d
15 Nm

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detailed solution

Correct option is B

τ=MB sin θτ=200 x 0.25 x sin30o=25 Nm

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