Q68
A copper wire of uniform cross-sectional area 1.0 × 0-6 m2 carries a current of 1 A. Assuming that each copper atom contributes one electron to the electron gas, the drift velocity of the free electrons (density of copper is 8.94 × 103 kg/m3 and its atomic mass is 1.05 × 10-25 kg) is
A.
7.4 × 10-4 m/s
B.
74 × 10-4 m/s
C.
74 × 10-3 m/s
D.
7.4 × 10-5 m/s
AnswerAnswer: Option D
Solution
Answer: Option D
No explanation is given for this question Let's Discuss on Board