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
    $2e, 1.6 \times 10^{-18} \text{ C}$
  • C
    $1.6 \times 10^{-19} \text{ C}, 2.5e$
  • D
    $1.5e, e$

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