An aluminum wire (resistivity ) has a radius of 0.40 mm

PHYSICS · Subjective · A Level · Physics · Electricity · Electricity

Problem

An aluminum wire (resistivity

2.8\times10^{-8}\,\Omega\!\cdot\!\text{m}

) has a radius of 0.40 mm. What is the maximum length of this wire that can be used if it must carry 5.0 A when connected to a 12 V power supply?

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