Cylinder == pipe ++ rod

Consider an iron cylinder, which is divided to extract a rod and a pipe, whose resistances are equal.

Find RcylinderRrod\dfrac{R_\text{cylinder}}{R_\text{rod}}.

Details and Assumptions:

Rcylinder=R_\text{cylinder}= Cylinder's radius.

Rrod=R_\text{rod}= Rod's radius.

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