A) \[MH\]
B) \[2MH\]
C) \[2\pi MH\]
D) Zero
Correct Answer: D
Solution :
[d] \[{{U}_{i}}=-MB\,\cos \,{{0}^{o}}=-MB\] and \[{{U}_{f}}=-MB\,\cos \,{{360}^{o}}=-MB\] Now, \[W={{U}_{f}}-{{U}_{i}}=-MB-(-MB)=0\]
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