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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

`(qbB)/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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