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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 : 

(1) 2 : 1 

(2) 1 : 2 

(3) 4 : 1 

(4) 1 : 4

Magnetic Effects of Current and Magnetism

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