An electron moving in a circular orbit of radius R with frequency $f$ .The magnetic field at the centre of the orbit is

\frac{μ_{o} e f}{2 π R}

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\frac{μ_{o} e f}{2 R}

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\frac{μ e f^{2}}{2 R}

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zero

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Solution

The correct option is D $\frac{μ_{o} e f}{2 R}$
Equivalent current:
$i = q f = e f$

$B = \frac{μ_{o} i}{2 R}$
$= \frac{μ_{o} e f}{2 R}$

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