Question

A body has a positive charge of $8\times {10}^{-19}C$. It has

• A. an excess of $5e^{-}$
• B. a deficiency of $5e^{-}$
• C. an excess of $8e^{-}$
• D. a deficiency of $8e^{-}$

Answer 1

The correct option is B a deficiency of $5e^{-}$

A body has a positive charge $=8\times {10}^{-19}C$

a deficiency of ${5e}^{-}$ because the body $1$ electron is $1.6\times {10}^{-19}C$.

$1.6\times {10}^{-19}C$ occupies $=1$ electron

$\therefore$ $8\times {10}^{-19}C$ occupies $=\frac{8\times {10}^{-19}}{1.6\times {10}^{-19}}=5$ electrons.