In Millikan's experiment for the determination of the charge on the electron, the reason for using the oil is

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Solution

Millikan's oil drop experiment:
The oil drop experiment was performed by Robert A. Millikan and Harvey Fletcher (1909) in order to measure the charge of the electron.
In the experiment, Millikan allowed the charged small oil droplets to travel through a hole into an electric field.
By varying the electric field's strength, the charge over an oil droplet is calculated and it always comes as a fundamental value of ' $e$ '.
In this experiment, Millikan used drops of non-volatile liquid (cloak oil) in order to prevent evaporation.
Therefore, the reason for using the oil in Millikan's experiment for the determination of the charge on the electron is to prevent evaporation.

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