Question

A copper wire of length 1 m and uniform cross sectional area 5 × 10-7 m2 carries a current of 1 A. Assuming that there are 8 × 1028 free electrons per m3 in copper, how long will an electron take to drift from one end of the wire to the other?

• A. 0.8 × 103 S
• B. 1.6 × 103 S
• C. 3.2 × 103 S
• D. 6.4 × 103 S

Answer 1

Answer: (D)

6.4 × 103 S

Answer 2

The correct answer is (D) : 6.4 × 103 S.