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2.39    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 \times 10^{-18} \ \textup{C}, calculate the number of electrons present on it.

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Given charge on the oil drop is -1.282\times10^{-18}C

and the charge carried by one electron is -1.6022\times10^{-19} C

Therefore, the number of electrons present on the oil drop carrying -1.282\times10^{-18}C charge is:

= \frac{-1.282\times10^{-18}C}{-1.6022\times10^{-19}C}

= 0.8001\times10 = 8.0

 

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Divya Prakash Singh

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