A circular tube of mean radius `8 cm` and thickness `0.04 cm` is melted up and recast into a
Channel: Doubtnut
Date: 2020-08-16

A circular tube of mean radius `8 cm` and thickness `0.04 cm` is melted up and recast into a solid rod of the same length. The ratio of the torsional rigidities of the circular tube and the solid rod i