A) evr
B) \[\frac{1}{2}evr\]
C) \[\pi {{r}^{2}}ev\]
D) \[2\pi rev\]
Correct Answer: B
Solution :
\[M=i\ (\pi {{r}^{2}})=\frac{ev}{2\pi r}\times \pi {{r}^{2}}\Rightarrow M=\frac{1}{2}evr\]
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