From the following, what charges can be present on oil drops in Millikan's experiment

(Here e is the electronic charge)

  • A

    Zero, equal to the magnitude of charge on $\alpha - $ particle

  • B

    $2e,\;1.6 \times {10^{ - 18}}C,$

  • C

    $1.6 \times {10^{ - 19}}C,\;2.5e$

  • D

    $1.5e,\;e$

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