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

A particle of mass m and charge q moves with a constant velocity v along the positive x direction. It enters a region containing a uniform magnetic field B directed along the negative z direction, extending from x = a to x = b. The minimum value of v required so that the particle can just enter the region x lt b is

qb B/m

`q(b-a)B//m`

qa B/m

`q(b+a)B//2m`

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