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A spherical drop of water has 1mm radius...

A spherical drop of water has `1mm` radius. If the surface tension of water is `70xx10^(-3)`N//m, then the difference of pressure between inside and outside of the spherical drop is:

A

`35N//m^2`

B

`70 N//m^2`

C

`140 N//m^2`

D

Zero

Text Solution

Verified by Experts

The correct Answer is:
C
`r=1xx10^(-3) m, sigma=70xx10^(-3) N//m`
`DeltaP = (2sigma)/r= (2xx70 xx10^(-3))/(10^(-3))=140N//m^2`
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