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An alpha particle and a proton enter a field at equal speed. The ratio of their radii (alpha : proton) is
A1 : 1
B4 : 1
C1 : 2
D2 : 1
Answer & Solution
Correct answer: D. 2 : 1
r is proportional to m/q; alpha has 4 times the mass and twice the charge, so the ratio is 2.
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