$A$ particle of charge $q$ and mass $m$ moving with a velocity $v$ along the $x$-axis enters the region $x > 0$ with a uniform magnetic field $B$ along the $\hat{k}$ direction. The particle will penetrate this region in the $x$-direction up to a distance $d$ equal to:
- AZero
- B$\frac{mv}{qB}$
- C$\frac{2mv}{qB}$
- DInfinity
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