A) MH
B) 2MH
C) \[2\pi MH\]
D) Zero
Correct Answer: D
Solution :
\[W=MB\left( \cos {{\theta }_{1}}-\cos {{\theta }_{2}} \right);\ \ {{\theta }_{1}}={{0}^{o}}\text{and}\ {{\theta }_{2}}={{360}^{o}}\]\[\Rightarrow W=0\]
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