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 $



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