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# A proton and an α−particle enter a uniform magnetic field at right angles to it with same velocity. The time period of α−particle as compared to that of proton, will befour timestwo timesone-fourthhalf

A
one-fourth
B
two times
C
half
D
four times
Solution
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#### Time Period T=2πmqB∴TalphaTproton=malphamproton×qprotonqalpha=41×12=2

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