Which particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field
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(a) $\nu = \frac{{qB}}{{2\pi m}} \Rightarrow \nu \propto \frac{q}{m}$
${\left( {\frac{q}{m}} \right)_{L{i^ + }}}$is minimum so $\nu_{{Li^+}}$ is minimum.
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