Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area `1.0 xx 10^(-7) m^2` carrying a current of 1.5 A. Assume the density of conduction electrons to be` 9 xx 10^28 m^(-3)` .

Explanation

Here `A = 1.0 xx 10^(-7) m^2 , I = 1.5 A , n = 9 xx 10^28 m^(-3) " and " e = 1.6 xx 10^(-19) C`
`I = nA ev_d`
` therefore ` Average drift speed `v_d = (I)/(nAe) = (1.5)/(9 xx 10^28 xx 1.0 xx 10^(-7) xx 1.6 xx 10^(-19) ) `
` = 1.04 xx 10^(-3) ms^(-1)" or " 1.04 mm s^(-1)`