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The number density of conduction electro...

The number density of conduction electrons in a copper conductor is `8.5xx10^(28) m^(-3)`. How long does an electron take to drift from one end of a wire 3.0 m long to its other end ? The area of cross-section of the wire is `2.0xx10^(-6) m^(2)` and it is carrying a current of 3.0 A.

A

`2.7xx10^(4)` sec

B

`2.7xx10^(-4)` sec

C

`2.7xx10^(2)` sec

D

2.7 sec

Text Solution

Verified by Experts

The correct Answer is:
A
`I=neAV_(d), V_(d)=(1)/(neA)`
`t=(l)/(V_(d))=l((neA)/(I))`
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