In a hydrogen atom, an electron of mass $m$ and charge $e$ revolves in an orbit of radius $r$ making $n$ revolutions per second. If the mass of hydrogen nucleus is $M$, the magnetic moment associated with the orbital motion of electron is
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(b)
Magnetic moment $= NiA$
$i=\frac{q}{T}=e n$
$A=\pi r^2$
$\text { and } N=1$
$\Rightarrow \text { Magnetic moment }(m)=(1)(e n)\left(\pi r^2\right)$
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