Current Electricity Part 4

A cylindrical conductor of length 2 m and area of cross-section 0.2mm2 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 α×10−3m2∕V. s. The value of α is :
(electron concentration =5×1028∕m3 and electron charge =1.6×10−19C )