Properties Of Solids And Liquids Question 389
Question: The force required to take away a flat circular plate of radius 2 cm from the surface of water, will be (the surface tension of water is 70 dyne/cm) [Pb. PET 2001]
Options:
A) $ 280\pi dyne $
B)$ 250\pi dyne $
C) $ 140\pi dyne $
D)$ 210\pi dyne $
Show Answer
Answer:
Correct Answer: A
Solution:
Force required, $ F=2\pi rT=2\pi \times 2\times 70=280\pi .Dyne $
