Question

How many electrons make up a charge of $20\mu C$ ?

• A. $1.25\times {10}^{14}$
• B. $2.23\times {10}^{14}$
• C. $3.25\times {10}^{14}$
• D. $5.25\times {10}^{14}$

Answer 1

The correct option is A $1.25\times {10}^{14}$

Charge on an electron $=1.6\times {10}^{-19}$coulomb

no of electrons required $=\frac{20\times {10}^{-6}}{1.6\times {10}^{-19}}=1.25\times {10}^{14}$