One angular metal ring of inner radius 7 cm and outer radius 14 cm and of negligible weight is floating on the surface of a liquid. If surface tension of liquid is 0.08Nm^(-1), calculate the force required to detach it from liquid surface.

One angular metal ring of inner radius 7 cm and outer radius 14 cm and

1.	One angular metal ring of inner radius 7 cm and outer radius 14 cm and of negligible weight is floating on the surface of a liquid. If surface tension of liquid is 0.08Nm^(-1), calculate the force required to detach it from liquid surface.
Answer» SOLUTION :The CONTACT length of annular ring with liquid surface L = `2pir_(1)+2pir_(2)` `L=2xx22/7xx(14+7),L=132cm=1.32m`