A charged particle with specific charge $S$ moves undeflected through a region of space containing mutually perpendicular uniform electric and magnetic fields $E$ and $B$ . When electric field is switched off, the particle will move in a circular path of radius
Medium
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$\mathrm{qE}=\mathrm{qVB}$
$\mathrm{V}=\mathrm{E} / \mathrm{B}$
$\mathrm{R}=\frac{\mathrm{mV}}{\mathrm{qB}}=\frac{1}{\mathrm{S}} \frac{(\mathrm{E} / \mathrm{B})}{\mathrm{B}}=\frac{\mathrm{E}}{\mathrm{B}^{2} \mathrm{S}}$
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