Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1mm. Conductor B is a hollow tube of outer diameter 2mm and inner diameter 1mm. Find the ratio of resistance RA to RB.
Given :
Diameter dA= 1mm
Radius rA= 0.5mm
Diameter dBout= 2mm
Radius rBout= 1mm
Diameter dBin= 1mm
Radius rBin= 0.5mm
1