Question

If $10^9$ electrons move out of a body to another body every second, then the time required to get a total charge of $1\,C$ on the other body is

• A. 250 years
• B. 100 years
• C. 198 years
• D. 150 years

Answer 1

Answer: (C)

198 years

Answer 2

The charge given out in one second $= 1.6 \times 10^{-19}\, C \times 10^9 = 1.6 \times 10^{-10}\, C$ Time required to accumulate a charge of $1\, C$ $=\frac{1}{1.6\times10^{-10}}=6.25\times10^{9}\,s=198$ years