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Math Help - radius of cable.

  1. #1
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    radius of cable.

    A cylindrical copper cable carries a current of 1370 A. There is a potential difference of 1.6 x 10^-2 V between two points on the cable that are 0.20 m apart. What is the radius of the cable?
    in meters

    not sure where to start.
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  2. #2
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    I just googled copper resistance and got this.

    electrical resistivity = ( electrical resistance * cross-sectional area ) / longitudinal length

    electrical resitance of cooper = 0.0000000168 ohm.m
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