A copper wire of radius 0.40 mm carries a current of 5.1 A.
Calculate the drift velocity of the electrons in the wire.
number of charge carriers per m3
for copper = 8.5 x 1028
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Answer:
Number of free electrons n=8.4×10
22
×10
6
per m
3
=8.4×10
28
per m
3
Current in the wire I=0.21 A
Cross-section of the wire A=1mm
2
=10 −6m 2
Thus drift velocity of electrons v= neAI
= (8.4×10 28 )×(1.6×10 −19 )×(10 −6 )0.21
=1.56×10 −5m/s
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