Surface Tension

Internal mean radius

%7B%7Br%7D_%7B1%7D%7D%5Csqrt%7B%7B%7Ba%7D_%7B1%7D%7D%7B%7Bb%7D_%7B1%7D%7D%7D

Internal circumference of the ring

%3D2%5Cpi%20%7B%7Br%7D_%7B1%7D%7D%3D2%5Cpi%20%5Csqrt%7B%7B%7Ba%7D_%7B1%7D%7D%7B%7Bb%7D_%7B1%7D%7D%7D

External mean radius

%7B%7Br%7D_%7B2%7D%7D%3D%5Csqrt%7B%7B%7Ba%7D_%7B2%7D%7D%7B%7Bb%7D_%7B2%7D%7D%7D

External circumference of the ring

%3D2%5Cpi%20%7B%7Br%7D_%7B2%7D%7D%3D2%5Cpi%20%5Csqrt%7B%7B%7Ba%7D_%7B2%7D%7D%7B%7Bb%7D_%7B2%7D%7D%7D

Thus, force required

F%3D2%5Cpi%20%5Csqrt%7B%7B%7Ba%7D_%7B1%7D%7D%7B%7Bb%7D_%7B1%7D%7DS%7D%2B2%5Cpi%20%5Csqrt%7B%7B%7Ba%7D_%7B2%7D%7D%7B%7Bb%7D_%7B2%7D%7D%7D%5C%2CS

%3D2%5Cpi%20(%5Csqrt%7B%7B%7Ba%7D_%7B1%7D%7D%7B%7Bb%7D_%7B1%7D%7D%7D%2B%5Csqrt%7B%7B%7Ba%7D_%7B2%7D%7D%7B%7Bb%7D_%7B2%7D%7D%7D)S

Chapter Questions
1 MCQs