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- MBsinθ
- MB
- MB(1−cosθ)
- MBcosθ

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Solution

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Now when it is deflected by an angle θ then Uf=−−→M.→B=−MBcosθ

Now we know that the work done = −ΔU

ΔU=Ui−Uf

ΔU=−MB(1−cosθ)

therefore, work done =MB(1−cosθ).

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