A uniform copper wire of length `1m` and cross section area `5 xx 10^(-7)m^(2)` carries a current of `1A`. Assuming that are `8 xx 10^(28)` free electron per `m^(3)` in copper, how long will an electron take to drift from one end of the wire an electron the other. Charge on an electron `= 1.6 xx 10^(-19)C`

Options

A. `0.8xx10^(3)s`
B. `1.6xx10^(3)s`
C. `3.2xx10^(3)s`
D. `6.4xx10^(3)s`

Answer

D

Explanation

`t=(l)/(V_(d)), V_(d)=(i)/("neA")`