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A particle with charge +Q and mass m ent...

A particle with charge `+Q` and mass m enters a magnetic field to magnitude `B` existing only of the right of the boundary `YZ` The direction of the motion of the particle is perpendicular to the direction of `B` Let `T =2pi(m)/(QB)` The time spent by the particle in the field will be
.

A

`(2 pi m)/(QB)`

B

`(pi m)/(QB)`

C

`(mv)/(QB)`

D

infinite

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The correct Answer is:
B
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