A thin flat circular disc of radius 4.5 cm is placed gently over the surface of water. If surface tension of water is 0.07 N/m, then the excess force required to take it away from the surface is [NEE…

Question

A thin flat circular disc of radius 4.5 cm is placed gently over the surface of water. If surface tension of water is 0.07 N/m, then the excess force required to take it away from the surface is [NEET 2024]

Accepted Answer

Correct answer: A. (a) Here, radius of disc (r )=4.5 cm=4.5 10^-2 m Surface tension (S )=0.07 Nm^-1 The force required to take away circular disc from the surface of water, F=S 2 πr=0.07 2 3.14 4.5 10^-2=1.9782 10^-2=19.8 mN

$A thin flat circular disc of radius 4.5 cm is placed gently over the surface of water. If surface tension of water is 0.07 N / m, then the excess force required to take it away from the surface is [NEET 2024]$

Solution

More Fluid Mechanics PYQs