A particle of charge $q$ and mass $m$ moving with a velocity $v$ along the $x$-axis enters the region $x > 0$ with uniform magnetic field $B$ along the $\hat k$ direction. The particle will penetrate in this region in the $x$-direction upto a distance $d$ equal to
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(b) It is easy to understand the given problem, along with the following figure.
$d$ = radius of path
$ = \frac{{mv}}{{qB}}$
$d$ = radius of path
$ = \frac{{mv}}{{qB}}$
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