At room temperature copper has free elec...

At room temperature copper has free electron density of `8.4xx10^(28) 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?

`4 m s^(-1)`

`0.4 ms^(-1)`

`4 cm s^(-1)`

`0.4 mm s^(-1)`

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