A) \[(2e/m)\,l\]
B) \[(e/2m)\,l\]
C) \[(e/m)\,l\]
D) \[(2m\text{/}e)\,l\]
Correct Answer: B
Solution :
[b] M = IA \[M=\frac{e}{T}\pi {{r}^{2}}\] \[M=\frac{ev}{2\pi r}\times \pi {{r}^{2}}\]\[M=\frac{evr}{2}\] But \[l=mvr\] Or \[r=\frac{l}{mv}\] \[\therefore M=\frac{ev}{2}\times \frac{l}{mv}\]or \[M=\frac{e}{2m}l\]
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