A cylinder of radius R is surrounded by a cylindrical shell of inner radius R and oputer radius 2R.
Channel: Doubtnut
Date: 2020-01-03

A cylinder of radius R is surrounded by a cylindrical shell of inner radius R and oputer radius 2R. The thermal conductivity of the material of the inner cylinder si `k_(1)` and that of the outer cylinder is `K_(2)` ,Assumming no loss of heat , the effective thermal conductivity of the system for heat flowing along the length of the cylionder is :