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
- A$\frac{\mu_0 e n}{2 R}$
- B$\frac{\mu_0 e n}{4 \pi R}$
- C$\frac{4 \pi \mu_0 e n}{R}$
- D$\frac{4 \pi \mu_0 e}{R n}$
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