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The excess pressure inside a spherical s...

The excess pressure inside a spherical soap bubble of radius 1 cm is balanced by a column of oil (Specific gravity = 0.8), 2 mm high, the surface tension of the bubble is

A

`3.92N//m`

B

`0.0392N//m`

C

`0.392N//m`

D

`0.00392N//m`

Text Solution

Verified by Experts

The correct Answer is:
B
`P=(4T)/R , P=hrho g`
`therefore hrhog=(4T)/R`
`T=(Rh rhog)/4 = (1xx10^(-2)xx2xx10^(-3)xx0.8xx10^(3)xx9.8)/4`
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