A charge on electron is `1.6 xx 10^(-19)` C. How many electrons will be passing in 2 seconds through a cross-section of a conducting wire carrying 0.7 A electric current ?

Options

A. 4.4 `xx 10^(18)`
B. `4.4 xx 10^(-18)`
C. `8.8 xx 10^(18)`
D. `8.8 xx 10^(-18)`

Answer

C

Explanation

`8.8 xx 10^(18)`
`I = (Q)/(t) = ("ne")/(t)`
` therefore n = (I t)/(e) = (0.7 xx 2)/(1.6 xx 10^(-19)) = 0.875 xx 10^(19)`
`therefore n approx 8.8 xx 10^(18)`