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At room temperature copper has free elec...

At room temperature copper has free electron density of `8.4xx10^(28) per m^(3)` . The copper conductor has a cross-section of `10^(-6)m^(2)` and carries a current of 5.4 A. What is the electron drift velocity in copper?

A

400 m/s

B

0.4 m/s

C

0.4 mm/s

D

72 m/s

Text Solution

Verified by Experts

The correct Answer is:
C
`v_(d) = ( I ) /( "ne A")` Here, `I = 5 .4 A, n = 8.4 xx 10^(28)`, per `m^3`
`A= 10^(-6) m^(2) , e= 1.6 xx 10^(-19) C`
`therefore v_(d) = ( 5.4 ) /( 8.4 xx 10^(28) xx 1.6 xx 10^(-19) xx 10^(-6) ) = 0.4` mm/s
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