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A copper wire has a diameter of 1.508 mm. What magnitude current flows when the drift velocity is 0.600 mm/s?
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Electricity is most commonly conducted in a copper wire. Copper has a density of 8.94 g/cm�, and an atomic weight of 63.546 g/mol, so there are 140685.5 mol/m�. In 1 mole of any element there are 6.02�1023 atoms (Avogadro's constant). Therefore in 1 m� of copper there are about 8.5�1028 atoms (6.02�1023 � 140685.5 mol/m�). Copper has one free electron per atom, so n is equal to 8.5�1028 electrons per m�

I = navq

I = 8.5*10^28*pi*(1.508/2)^2*0.6*1.6*10^-19*10^-9

= 14.574 A
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