A tube of fine bore AB is connected to a manometer M as sho… | CGP Edu

Physics Surface Tension Surface Tension MCQ (Single Correct)

A tube of fine bore AB is connected to a manometer M as shown. The stop cock S controls the flow of air. AB is dipped into a liquid whose surface tension is σ . On opening the stop cock for a while, a bubble is formed at B and the manometer level is recorded, showing a difference h in the levels in the two arms. if ρ be the density of manometer liquid and r the radius of curvature of the bubble, then the surface tension σ of the liquid is given by

A

ρ hrg

B

2 ρ hgr

C

4 ρ hrg

D

Text Solution

Verified by Experts

The correct answer is:

P A has to be equal to P B .

P A = P 0 + ρ gh .....(i)

Now P C – P 0 =  soap bubble has 2 films

and P C = P B  same air is filled

P 0 + = P 0 + ρ gh ....(ii)

get σ =

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