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A long conducting wire has a current flowing through and the current density in the wire can he expressed as: where J=ll Palm; is a

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A long conducting wire has a current flowing through and the current density in the wire can he expressed as: where J=ll Palm; is a constant and Ft=l.5 mm is the full radius of the wire. a. What is the total current flowing through the wire (Note: dA=1rdr]? I]. If the current is being caused by a E- U applied potential difference what is the resistance of the wire? c. If the wire through which the current flows is 4 mm long what is the resistivityr of the wire? cl. How much [average] work is needed to keep the current flowing for 1.5 s

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