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

Explanation

In one second `10^(9)` electrons move out of the body. The charge given out in one second is `1.6 xx 10^(-19) xx 10^(9)C = 1.6 xx 10^(-10)C`. The time required to accumulate a charge of 1C can then be estimated to be
`t= 1C div (1.6 xx 10^(-10)C//s) = 6.25 xx 10^(9) s= 6.25 xx 10^(9) div (365 xx 24 xx 3600)` years = 198 years. One coulomb is a very large unit for many practical purposes.