A charged particle of mass $m$ and charge $q$ describes circular motion of radius $r$ in a uniform magnetic field of strength $B$. The frequency of revolution is
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(a) Time period is given by $T = \frac{{2\pi m}}{{qB}}$
$==>$ Frequency $\nu = \frac{1}{T} = \frac{{qB}}{{2\pi m}}$
$==>$ Frequency $\nu = \frac{1}{T} = \frac{{qB}}{{2\pi m}}$
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