A particle of charge q and mass m moving...

A particle of charge `q` and mass `m` moving with a velocity `v` along the x-axis enters the region `xgt0` with uniform magnetic field `B` along the `hatk` direction. The particle will penetrate in this region in the `x`-direction upto a distance `d` equal to

Zero

`(mv)/(qB)`

`(2mv)/(qB)`

Infinity

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