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The number density of free electrons in ...

The number density of free electrons in a copper conductor estimated is `8.5x10^28m^(-3)`. How long does an electron take in drifting from one enf of a wire 3.0m long to its other end? The area of cross-section of the wire is `2.0x10^(-8)m^2` and it is carrying a current of 3.0A.

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