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A charged particle of charge q and mass m, gets deflected through an angle `theta` upon passing through a square region of side 'a' which contains a uniform magnetic field B normal to its plane. Assuming that the particle entered the square at right angles to one side, what is the speed of the particle ?

A

`(qB)/(m)acot(theta)`

B

`(qB)/(m)atan(theta)`

C

`(qB)/(m)acot^(2)(theta)`

D

`(qB)/(m)atan^(2)(theta)`

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The correct Answer is:
A
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