In Millikan'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 −1.282×10−18C. Calculate the number of electrons present on it.
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Solution
the static electric charge on the oil drop is, q=1.282×10−18 C. We know that Charge q=ne where n is the no. of electrons and e is the charge of 1 electron, i.e. 1.602×10−19C
The number of electrons present in the oil drop is, n=1.282×10−181.602×10−19=8.