The length of copper wire is 100m and its radius is 1 mm. Calculate its resistance if resistivity of copper is 1.72×10^-8
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Answer:
R= q(resistivity)× L( length)/ A(area)
A = πr²
= 22/7 × (10^-3)²
R = 1.72× 10^-8 × 100×7/22× (10^-3)²
= 56.6 × 10^-2
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