Current Electricity

A cylindrical conductor of length 2 m and area of cross-section $0.2 \mathrm{~mm}^2$ carries an electric current of 1.6 A when its ends are connected to a 2 V battery. Mobility of electrons in the conductor is $\alpha \times 10^{-3} \mathrm{~m}^2 / \mathrm{V} . \mathrm{s}$. The value of $\alpha$ is :

(electron concentration $=5 \times 10^{28} / \mathrm{m}^3$ and electron charge $=1.6 \times 10^{-19} \mathrm{C}$ )