The value of e/m for an electron is

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1.00866 c/g

1.6724 × 10^–24 c/g

1.78 × 10⁸ c/g

0.005486 c/g

answer is A.

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Detailed Solution

Millikan determined the charge and mass on the electron through his famous Oil Drop Experiment and the values

were: e = -1.6 × 10^-19 C and m = 9.1 × 10^-31 kg.

On calculation, it is found that e/m = E/H²r where E is strength of electric field. H is strength of magnetic field and r is the radius of the curved path taken up by the electron as it moves through the magnetic field.
The value of e/m ratio for an electron is =1.78 × 10⁸ c/g

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