Question

A body has a charge of one coulomb. The number of excess (or lesser) electrons on it from its normal state will be :

• A. $\infty$
• B. $1.6\times {10}^{-19}$
• C. $1.6\times {10}^{19}$
• D. $6.25\times {10}^{18}$

Answer 1

The correct option is D $6.25\times {10}^{18}$

The Charge $q$ on a body must always exist as an integral multiple of the fundamental unit charge $e$, the charge of an electron, where $e=1.6\times {10}^{-19}C$.
Thus for 1 coulomb of charge the body will hold $1/1.6\times {10}^{-19}=6.25\times {10}^{18}$ electrons.