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A copper wire of cross sectional area A=1.7 mm2 and Lenght L=1 m carries a current...

A copper wire of cross sectional area A=1.7 mm2 and Lenght L=1 m carries a current of I=6.4 A at the temperature of T1= 20 0C. a) How many electrons pass through a cross section of the wire in each second? b) What is the resistance of the wire ? c) What is the potential difference between the ends of the wire? d) What is the resistance of the wire at the temperature of T2= 100 0C? (r=1.7x10-8 W.m, a=7x10-3 0C-1)
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