A paper disc of radius R from which a hole of radius r is cut out is floating in a liquid of the surface tension S…

Q: A paper disc of radius R from which a hole of radius r is cut out is floating in a liquid of the surface tension S. The force on the disc due to the surface tension is

(a) S × 2π R

(b) S × 2πr

(c) S × 2π (R – r)

(d) S × 2π (R + r)

Ans: (d)

Author: Rajesh Jha

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