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Question

A beaker is filled with liquid solution. A soap bubble of radius 1 mm is formed in the bulk of liquid solution. If surface tension of liquid is 1.6 N/m, find the excess pressure inside the soap bubble.



Your Answer
A
1.6×103 N/m2
Correct Answer
B
3.2×103 N/m2
Your Answer
C
0.8×103 N/m2
Your Answer
D
None of these 

Solution

The correct option is A 3.2×103 N/m2

We know,
For soap bubble in bulk of the liquid, only one interface is present. 
ΔP=2TR
Where, ΔP = Excess pressure
T= Surface tension of liquid 
R= radius of bubble
ΔP=2×1.61×103 N/m2
=3.2×103 N/m2

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