The work done in turning a bar magnet normal to field direction from the direction of the field is 40×10-6J. The kinetic energy attained by it when it reaches the field direction when released is ---------------
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a
3×10-6 J
b
4×10-5 J
c
4×10-6 J
d
2×10-5 J
answer is B.
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Detailed Solution
The amount of work done is stored in the form of K.E.K.E = Work done = 40×10-6J
The work done in turning a bar magnet normal to field direction from the direction of the field is 40×10-6J. The kinetic energy attained by it when it reaches the field direction when released is ---------------