Show that drift velocity of electrons in a conductor is given by u = `J/(ne)` where J is the current density, n is the number of mobile electrons per unit volume and e is the charge carried by each electron. Calculate the same in a copper wire of radius of 0.6mm when a current of 1A flows through it assuming that one mobile electron is available from one atom of copper. Atomic weight of copper = 63.55, density of copper = 8930 kgm^(-3)`, Avogadro number = `6.01 xx 10^(26)`Kg `mol^(-1)` and e = `1.6 xx 10^(-19)`C

Answer

`6.5 xx 10^(-5)ms^(-1)`