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A proton of mass m and charge q enters a...

A proton of mass m and charge q enters a region of uniform magnetic field of a magnitude B with a velocity v directed perpendicular to the magnetic field. It moves in a circular path and leaves the magnetic field after completing a quarter of a circle. The time spent by the proton inside the magnetic field is proportional to:

A

`v^(-1//2)`

B

`v^(1//2)`

C

`v^(0)`

D

`v`

Text Solution

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The correct Answer is:
C
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