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Drift speed of electrons, when 1.5 A of ...

Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross setion `mm^(2)` , is v. If the electron density in copper is `9xx10^(28)//m^(3)` the value of v in `mm//s` close to (Take charge of electron to be `=1.6xx10^(-19)C)`

A

0.2

B

3

C

2

D

0.02

Text Solution

Verified by Experts

The correct Answer is:
D
`I ="ne"Av_(d)`
`1.5/(1.6 xx 10^(-19) xx 5 xx 10^(-6) xx 9 xx 10^(25)) = v_(d)`
`1.5/72 xx 10^(-3) = v_(d) =0.02 mm//s`
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