Two conductors are made of the same material and have the samelength. Conductor

Question

Two conductors are made of the same material and have the samelength. Conductor A is a solid wire of diameter 1.4 mm.Conductor B is a hollow tube of outside diameter 7.7 mmand inside diameter 6.7 mm.
What is the resistance ratio RA/RB ,measured between their ends? Two conductors are made of the same material and have the samelength. Conductor A is a solid wire of diameter 1.4 mm.Conductor B is a hollow tube of outside diameter 7.7 mmand inside diameter 6.7 mm.
What is the resistance ratio RA/RB ,measured between their ends?

Explanation / Answer

Becausce the two conductor have the same length, resistivity so Ra/Rb=Sb/Sa. Sa=*1,4^2/4. Sb=*(7,7^2-6,7^2)/4. so Sa/Sb=1,4^2/(7,7^2-6,7^2)=0,136=Rb/Ra so Ra/Rb=7,35

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