What will be the resistance of a copper wire of Length 125 m and dia – InterviewSolution

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1.	What will be the resistance of a copper wire of Length 125 m and diameter 3 mm at 20°C? (Given Pcopper = 1.62 x 10-8 m).
Answer» GIVEN,LENGTH= 125mdimeter=3mm3/1000=3×10-3theta =20°cR= PL/AR=1.62×10-8×125/π/4×(3×10-3)2R=4× 1.62×10-8×125/3.14×9×10-6R=500×162×10-8×10-6/314R=1.59×162×10-2R=257×10-2R=257/100R=2.57ohhm

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