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There are 8.4xx10^(22) free electrons pe...

There are `8.4xx10^(22)` free electrons per `cm^(3)` in copper. The current in the wire is `0.21A` (e=`1.6xx10^(-19)C`). Then the drifts velocity of electrns in a copper wire of `1mm^(2)` cross section, will be:-

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