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8. 90 C of charge passes in one hour and 15 min, in acopper wire of diameter 1 mm. Copper contains 5.8 x10^28 electrons m-3. Find (i) current in the wire (ii)drift velocity of electron in the wire.[Ans. 2 × 10-2 A, 2.74 × 10-6 ms-1]

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