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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 `xgtb` is

A

`q bB//m`

B

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

C

`qaB//m`

D

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

Text Solution

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The correct Answer is:
B
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