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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 regio 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 of `x gt b ` is

A

`(qbB)/m`

B

`(qaB)/m`

C

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

D

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

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