(Answered) A rod of 20 m length and a square 200 mm x 20 mm cross

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A rod of 2.0 m length and a square (2.00 mm x 2.0 mm) cross section is made of a material with a resistivity of 6.0 x 10^-8 omega m. If a potential difference of 0.50 V is placed across the ends of the rod, at what rate is heat generated in the rod? How is 8.3W the answer?

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