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^–1, then the excess force required to take it away from the surface is :
(1) 19.8 m N
(2) 198 N 
(3) 1.98 m N
(4) 99 N                           NEET -2024 
Solution:                
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^–1, then the excess force required to take it away from the surface is :

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