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If the excess pressure inside a soap bub...

If the excess pressure inside a soap bubble is balanced by oil column of height 2 mm , then the surface tension of soap solution will be (r = 1 cm and density `d = 0.8 g "cc"^(-1)) , g = 10 m s ^(-2)`

A

3.9 N/m

B

`3.9xx10^(-2)` N/m

C

`3.9xx10^(-3)` N/m

D

3.9 dyne/m

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaP = (4sigma)/R = rhogh`
`implies sigma=(Rhrhog)/(4) = (1xx10^(-2)xx2xx10^(-3)xx0.8 xx9.8 xx10^3)/(4)`
`=3.9 xx10^(-2) N//m`
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