If an electron revolves around a nucleus in a circular orbit of radius $R$ with frequency $n$, then the magnetic field produced at the centre of the nucleus will be
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(a)
Current $(i)=\frac{q}{T}=q\left(\frac{1}{T}\right)=q n$
So $\vec{B}=\frac{\mu_0 i}{2 R}=\frac{\mu_0(n e)}{2 R}$
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