The number density of free electrons in copper is nearly 8 x 10 28 m -3 . A copper wire has its area of cross-section = 2 x 10 -6 m 2 and is carrying a current of 3.2 A. The drift speed of the electrons is_____x 10 -6 m s -1 .
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The formula to calculate the current through any conductor is given by
I = nAev d ...
Substitute the values of the given parameters into equation and solve to calculate the required drift velocity of the electrons.
3.2 = 8 x 10 28 x 2 x 10 -6 x 1.6 x 10 -19 x v d
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