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he surface tension of water is 0.072m^(-...

he surface tension of water is `0.072m^(-1)` The excess pressure inside a water drop, of diameter 1.2 mm,is

A

10 Pa

B

20 Pa

C

5 Pa

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
Express pressure, `Delta p=(4T)/(r )=(4xx2xx25xx10^(-2))/(1xx10^(-2))`
`=20 Nm^(-2)=20 Pa " " ("as" r=d//2)`
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