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  4. How many electrons make up a charge of 20 μ C

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Q. How many electrons make up a charge of $20 \, \mu C$

Electric Charges and Fields

Solution:

Charge on an electron $ = 1.6 \times 10^{-19}$ coulomb
No. of electrons required $ = \frac{20 \times 10^{-6}}{1.6 \times 10^{-19}}$
$ = \frac{20}{1.6} \times 10^{13} = 1.25 \times 10^{14}$