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An 18 gauge copper wire (the size usually used for lamp cords), with a diameter of 1.02 mm,1.02 mm, carries a constant current of 1.67 a1.67 a to a 200 w lamp. the free-electron density in the wire is 8.5×10288.5×1028 per cubic meter. find (a) the current density and (b) the drift speed.
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An 18 gauge copper wire (the size usually used for lamp cords), with a diameter of 1.02 mm,1.02 mm,...
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