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The number density of free electrons in ...

The number density of free electrons in a copper conductor estimated in textual example 6.1 is `8.5 xx 10^(28) m^(-3)`. How long does an electrons 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 `2.0 xx 10^(-6) m^(2)` and it is carrying a current of 3.0 A

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