The length of the cable will be 6 feet which can be installed 120-volt/15-amp circuit.
Ampere's circuital law states that “the line integral of the magnetic field surrounding closed-loop equals to the number of times the algebraic sum of currents passing through the loop.”
Here we have a cable rating of 120-volt/15-amp so if the 1-ampere circuit means 1 watt per foot cable will be used for the 1-ampere circuit.
A Total of the 15-ampere circuit means 15 watts needed so we are using 2.5 watts per foot.
[tex]\rm Length \ of\ Cable =\dfrac{15}{2.5}=6 \ \ foot[/tex]
Hence the length of the cable will be 6 feet which can be installed 120-volt/15-amp circuit.
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