Question

If 10^10 electrons are taken out every second from a body, how much time is required to get a total charge of 0.1 C from it?

Answer 1

number of electrons are taken out every second = 10^10

Let time is required to get a total charge of 0.1 C from it = t

so, number of electrons are taken out = 10^10 t

we know, charge on each electron = 1.6 × 10^-19 C

so, charge on 10^10t electrons , C = 1.6 × 10^-19 × 10^10 t

it is given that, charge on 10^10t electrons is 0.1C

so, 1.6 × 10^-19 × 10^10 t = 0.1

or, 1.6 × 10^-9 × t = 0.1

or, t = 0.1 × 10^9/1.6 = 6.25 × 10^7 sec

hence, time is required to get total charge 0.1C from it = 6.25 × 10^7 sec