Question

A copper conductor of circular cross section 5mm in diameter is 5m long.
Calculate its resistance at 20°C if the resistivity of copper at 20°C is
1.72 x 10-8 m.​

Answer 1

Answer:

Step-by-step explanation:

Answer = 9.2

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Answer 2

Answer:

4.38 milliohm

Step-by-step explanation:

The resistance R of a cylinder of length L and cross-sectional area A is  

R= (ρL)/A , where ρ is the resistivity of the material.

R= (ρL)/A=(1.72x10^-8 x 5) / pi(5x10^-3)^2/4 = 4.38 milliohm