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Question

Question: Force necessary to pull a circular plate of 5 cm radius from water surface for which surface tension...

Force necessary to pull a circular plate of 5 cm radius from water surface for which surface tension is 75 dynes/cm, is

A

B

60 dynes

C

750 dynes

D

750 π\pi dynes

Answer

750 π\pi dynes

Explanation

Solution

The total length of the circular plate on which the force will act =2πR= 2 \pi R

Force to pull =2πRT=2×π×5×75=750π= 2 \pi R T = 2 \times \pi \times 5 \times 75 = 750 \pi dynes