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  3. 4 0 5 x 10 19 a there are 8 4 x 1022 free electron

4 0 5 x 10 19 A There are 8 4 x 1022 free electrons...

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4 0 5 x 10 19 A There are 8 4 x 1022 free electrons per cm in copper The current in the wire is 0 21 A e 1 6 x 10 19 C Then the drifts velocity of electrons in a copper wire of 1 mm cross section will be nwone 192 1 2 12 x 10 5 m s 3 1 56 x 10 5 m s There is a current of 40 amporos 2 0 78 x 10 5 m s 4 none of these

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