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A particle of the mass m and cgharge ...

A particle of the mass ` m ` and cgharge ` 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 minimum value of `v` required so that the particle can just enter the region ` xgtb` is

A

`q b B//m`

B

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

C

`q a B//m`

D

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

Text Solution

Verified by Experts

The correct Answer is:
`B`
`r = (mV)/(qB)`
`(b-a) = (mV_(min))/(qB)`
`V_(min) = (q(b-a)B)/(m)`
.
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