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Q.

The ratio of specific charge of a proton and an $α$ -particle is

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a

2 : 1

b

1 : 2

c

1 : 4

d

1 : 1

answer is A.

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Detailed Solution

Charge on proton = +1 unit, charge on $α$ particle = +2 units, 2 : 1.
$\frac{\frac{e}{m} p}{\frac{e}{m} He} = \frac{\frac{1}{1}}{\frac{2}{4}} = \frac{1}{1} \times \frac{2}{1} = 2 : 1$

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The ratio of specific charge of a proton and an α -particle is