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The instructions for an electric grass trimmer suggests that a 20 gauge wire can be used...

The instructions for an electric grass trimmer suggests that a 20 gauge wire can be used for distances up to 35m, but a wire as small as possible should be used. The cross sectional area of ​​the 20 gauge cable is 5.2 * 10 ^ -17 m ^ 2 while that of the cable is 16 is 13 * 10 ^ -7 m ^ 2. Determine the resistance of 35 m of cable 20 and 75 for copper 16.

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