Question

The number of charged particles flowing per sec through a heater is $5\times {10}^{20}$ . What is the current passed through it?

• A. $8A$
• B. $80A$
• C. $50A$
• D. $16A$

Answer 1

The correct option is B $80A$

Magnitude of charge of electron is $1.6\times {10}^{-19}$C

So total charge, $q=5\times {10}^{20}\times 1.6\times {10}^{-19}=80C$

Now current $i=\frac{q}{t}=80A$ , as time is $1$ second.