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12 A 5 80 m length of 2 0 mm diameter wire carries a 750...

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12 A 5 80 m length of 2 0 mm diameter wire carries a 750 mA current when 22 0 mV is applied to its ends the drift speed is 1 7 x 10 m s determine T2 500 C a The resistance R of the wire b The resistivity p and c The number n of free electrons per unit volume 3 At a point high in the Earth s atmosphere He ions in a concentration of 2 8 x 1012 m are moving due north at a speed of 2 0 x 106 m s Also a 7 0 x 1011 m concentration of O ions is moving due south at a speed of 7 2 x 106 m s Determine the magnitude and direction of the net current passing through unit area A m

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