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Questions  

A proton and an α-particle enter a uniform magnetic field moving with the same speed. If the proton takes 25 μs to make 5 revolutions, then the periodic time for the α-particle would be

a
50 μs
b
20 μs
c
10 μs
d
5 μs

detailed solution

Correct option is C

T=2πmqB⇒TpTα=mαqα×qpmp

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