A) \[\frac{e}{m}l\]
B) \[\frac{e}{2m}l\]
C) \[\frac{2e}{m}l\]
D) \[\frac{e}{2\pi m}l\]
E) \[\frac{e}{4\pi m}l\]
Correct Answer: B
Solution :
\[\frac{\mu }{L}=\frac{1}{2}\frac{e}{m}\] \[\mu =\frac{1}{2}\frac{eL}{m}=\frac{eL}{2m}\]
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