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A charged particle q enters a region of ...

A charged particle q enters a region of uniform magnetic field B (out of page) and is deflected distance d after travelling a horizontal distance a. The magnitude of the momentum of the particle is

A

`(qB)/2[(a^2)/d+d]`

B

`(qB)/2`

C

Zero

D

2qB

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The correct Answer is:
A
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