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Millikan's Oil Drop Experiment

In Milikan's ...

Question

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 × $10^{- 18}$ C, calculate the number of electrons present on it.

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Solution

Charge on the oil drop = 1.282 × $10^{- 18}$ C
Charge on one electron = 1.6022 × $10^{- 19}$ C
$∴$ Number of electrons present on the oil drop
$\frac{1.282 \times 10^{- 18} C}{1.6022 \times 10^{- 19} C} = 0.8001 \times 10^{1} = 8.0$

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Millikan's Oil Drop Experiment

Standard XII Chemistry

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