In Milikan's experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is - 1.282 X 10^-18C, calculate the number of electrons present on it.

Solution

Charge on the oil drop =1.2820x10^-18C

Charge on the electron =1.6022 x10^-19C

Therefore,

Number space of space electrons space present space in space oil space drop equals space fraction numerator negative 1.282 space cross times space 10 to the power of negative 18 end exponent straight C over denominator negative 1.6022 space cross times space 10 to the power of negative 19 end exponent straight C end fraction space equals space 8

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