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Q.

At room temperature, copper has free electron density of 8.4 x 10²⁸ m^-3. The electron's drift
velocity in a copper conductor of cross-sectional· area of 10^-6 m² and carrying a current of 5.4 A, will be

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a

4 ms^-1

b

0.4 ms^-1

c

4 cms^-1

d

0.4 mms^-1

answer is D.

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Detailed Solution

Drift velocity in a copper conductor,

$v_{d} = \frac{i}{n e A} = \frac{5.4}{8.4 \times 10^{28} \times 1.6 \times 10^{- 19} \times 10^{- 6}}$

= 0.4 x 10^-3ms^-1 = 0.4 mms^-1

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