Question

determine the resistance of a copper wire having a length of 1 km and diameter of 0.5mm.plzz explain this sum to me with detail calculations No Shortcuts at all

Answer 1

[0010001111]... Hello User... [1001010101]
Here's your answer...

The formula for finding resistance when the length, area of cross section and resistivity is give is...

R = § L/A
(§ is resistivity, I don't have the rho symbol)

L = 10³ m
A = pi × 0.25 × 0.25 × 10^-6 m
= 625 pi × 10^-10 m
R = 1.7×10^-8 × 10^3 × 10^10 / 625 pi
$(1.7 \times {10}^{ - 8} \times {10}^{3} \times {10}^{10} ) \div 625\pi$
≈ 86.58 ohm

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