Question

A body is having a charge of 10 C. When it comes in contact with an charged body then it loses-1.6C of charge. Find the number of electrons lost.

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

Answer 1

The correct option is C

${10}^{19}$

We know Q = ne^– from our childhood memories!

Lost charge = -1.6 C

Hence $-1.6=n\times (-1.6\times {10}^{-19}C)$

$n={10}^{19}$

Implies the body lost ${10}^{19}$ electrons to the unchanged body.