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A charged particle (+q) enters into a u...

A charged particle (+q) enters into a uniform magnetic field region of induction B and desribes a circle. The kinetic energy of the charged particle is

A

`(q^2B^2r^2)/(2m)`

B

`(qBr^2)/(2m)`

C

`(qB^2r)/(2m)`

D

`(q^2Br)/(2m)`

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