Estimate the average drift speed of conduction electrons in ...

CBSE Class 12 Physics 2014 Outside Delhi Set 1 Paper

Question : 14 of 30

Marks: +1, -0

Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area 1.0×10−7m2 carrying a current of 1.5A. Assume the density of conduction electrons to be 9×1028 m−3.

Solution:

vd=‌

nAq

‌, where ‌
I is the current
n is charge density
q is the charge of electron and
A is the cross sectional area
‌vd=‌

1.5

9×1028×1.0×10−7×1.6×10−19

‌vd=10.4×10−4m∕ sec

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