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  4. The number of electron in 2 coulomb of charge is

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Q. The number of electron in $2$ coulomb of charge is

WBJEEWBJEE 2009Electric Charges and Fields

Solution:

Charge $q=n e$
$\therefore n=\frac{q}{e}=\frac{2}{1.6 \times 10^{-19}}$
$=12.5 \times 10^{18}$