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?

`4ms^(-1)`

`0.4ms^(-1)`

`"4 cm s"^(-1)`

`"0.4 mm s"^(-1)`

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