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The number density of free electrons in a copper conductor estimated in is `8.5 xx 10 ^(28) m ^(-3).` How long does an electron take to drift form 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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