Question

# Drift speed of electrons, when 1.5A of current flows in a copper wire of cross section 5mm2, is v. If the electron density in copper is 9×1028/m3 the value of v in mm/s is close to (Take charge of electron to be =1.6×10−19C)

A
0.2
B
3
C
2
D
0.02
Solution
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#### The correct option is D0.02I=neAvd⇒vd=IneA=1.59×1028×1.6×10−19×5×10−6=0.02mm/s

5
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