A copper wire has a square cross-section, 2.0 mm on a side. It carries a current of 8 A and the density of free electrons is 8 × 1028 m–3. The drift speed of electrons is equal to 

(1) 0.156 × 10–3 m.s–1

(2) 0.156 × 10–2 m.s–1

(3) 3.12 × 10–3 m.s–1

(4) 3.12 × 10–2 m.s–1

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