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A cylindrical copper cable carries a current of 1170 A. There is a potential difference of 1.60 10-2 V between two points on the cable that are 0.21 m apart. What is the radius of the cable?

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Resistancebetweenpoints=V/I solve that.

Resistance= resitivity*length/(PI*r^2)
solve for lenght. look up resistitivty of Cu.

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