Subjective Type

What is the unique property shown by the charge of an oil drop?

Solution

Charge of an oil drop shows that it was quantized, always a multiple of $$-1.6 \times10 ^{-19} C$$ i.e. charge of single electron.
A balance of the electrostatic force and gravitational force on the oil drop helped to give us an estimate of the charge $$q$$ by:
$$mg=qE$$
$$q=\dfrac{mg}{E}$$
$$E$$ is the electric field and $$mg$$ is the weight of the drop.

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