See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

The torque due to liquid in annular space is   2 1 1 2 1 R 2 R H R R R            where velocity gradient 2 2 1 R R R    Also torque due to liquid in between space in bottom of thickness ‘h’   1 R 0 x R (x) 2 xdx h 2h       