A bar magnet of moment m = 4.0 Am^(2) li...

A bar magnet of moment `m = 4.0 Am^(2)` lies on a table horizontally in the earth's magnetic field `H = 30 Am^(-1)`. A student turns it and holds it erect on the table. What is the work done by the student.

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The correct Answer is:

`mu_(0)mH = 1.5 xx 10^(-7)J`

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