A current of 2 A flows through a wire of cross-sectional area 25.0 mm 2 . The number of free electrons in a cubic meter are 2. 0 x 10 28 . The drift velocity of the electrons is _____x 10 -6 ms -1 (given, charge on electron = 1.6 x 10 -19 C).
Text Solution
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(25)
The drift velocity is given by
... (i)
The given data is
I = 2 A
A = 25x10 -6 m 2 n = 2x 10
28
e=1.6x10 -19 C
Substituting the given values in equation (i)
2 = 2 x 10 28 x 25 x 10 -6 x 1.6 x 10 -19 x v d
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