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Solution


Q.

A bar magnet with a magnetic moment 5.0 Am2 is placed in parallel position relative to a magnetic field of 0.4 T. The amount of required work done in turning the magnet from parallel to antiparallel position relative to the field direction is ________.         [2023]
1 4 J  
2 1 J  
3 2 J  
4 Zero  

Ans.

(1)

u=-MBcosθ

W=Δu

W=-MBcos180°(-mBcos0°)

W=2MB=2×5×0.4=4 J