Ionized hydrogen atoms and α -particles with same momenta enters perpendicular to a constant magnetic field, B. The ratio of their radii of their paths rH : rα will be

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1 : 4

2 : 1

1 : 2

4 : 1

answer is B.

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Detailed Solution

r=mvqB=pqB For given p and B,r∝1q⇒rHrα=qαqH=21

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