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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,

vd=ineA=5.48.4×1028×1.6×10−19×10−6

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

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