A particle of mass `m` and charge `q` moves with a constant velocity `v` along the positive `x` direction. It enters a region co

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 gt b` is
A. `qb B//m`
B. `q(b-a)B//m`
C. `qa B//m`
D. `a(b+a)B//2m`

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 mag

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