Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area `2.0 xx 10^(-7)m^(2)` carrying a current of 3.0 A. Assume that each copper atom contributes roughly one conduction electron. The density of copper is` 9.0 xx10^(3) kg//m^(3)`, and its atomic mass is 63.5 u.

Explanation

(i) `1.1 xx10^(-3)ms^(-1)`, (ii) `3xx10^8 m s^(-1)`