A disc of paper of radius R has a hole of radius r. It is floating on a liquid of surface tension T. The force of surface tension of the disc is

A disc of paper of radius R has a hole of radius r. It is floating on

1.	A disc of paper of radius R has a hole of radius r. It is floating on a liquid of surface tension T. The force of surface tension of the disc is
Answer» `Txx2piR` `Txx2pi(R-r)` `Txx2pi(R+r)` `Txx4pi(R+r)` ANSWER :C