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A beam of alpha particles having specifi...

A beam of `alpha` particles having specific charge `2.5 xx 10^7 C kg^-1` moves with a speed of `2 xx 10^5 m s^-1` in a magnetic field of 0.05 T. The radius of the circular path described by the `alpha`-particle is

A

4 cm

B

8 cm

C

16 cm

D

32 cm.

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