A magnet of moment 4 A m 2 is kept suspended in a magnetic field of induction 5 × 10 - 5 T . The work done in rotating it through 180 0 is

Question

A magnet of moment 4 A m 2 is kept suspended in a magnetic field of induction 5 × 10 - 5 T . The work done in rotating it through 180 0 is, 4 × 10 - 4 J, 5 × 10 - 4 J, 2 × 10 - 4 J, 10 - 4 J

MARKS App · Accepted Answer

W = − M . B ( cos θ f − cos θ i ) = ( − ) 4 × 5 × 10 − 5 ( cos 180 − cos 0 ) = − 20 × 10 − 5 ( − 1 − 1 ) = 4 × 10 − 4 J

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