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An oil drop has $-6.39\times10^{-19}$ coulomb charge .The number of electrons in this oil drop is


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Charge on one electron = $-1.60\times10^{-19}$
$\therefore$ The number of electron = $\large\frac{-6.39\times10^{19}}{-1.60\times10^{-19}}$
Thus the number of electron = 4
Hence answer is (a)
answered Feb 9, 2014 by sharmaaparna1

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