A circular disc of a diameter `'d'` slowly rotated in a liquid of large `'eta'` at a small distance
Channel: Doubtnut
Date: 12/04/2020

A circular disc of a diameter `'d'` slowly rotated in a liquid of large `'eta'` at a small distance `'h'` from a fixed surface as shown in figure. If an expression for torque `'tau'` necessary to maintain an angular velocity `'omega'` is `(pietad^(4))/(lambdah)` then fidn `lambda`.   img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/RES_WFPM_PHY_XI_C03_E01_041_Q01.png" width="80%"