Q.

What should be the pressure inside a small air bubble of 0.2mm diameter situated just below the surface of water. 
(Surface tension of water = 0.072N/m)

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a

1.44×104 Pa

b

1.44×103 Pa

c

1.44×102 Pa

d

1.44×105 Pa

answer is B.

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Detailed Solution

P=P0+2Tr

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What should be the pressure inside a small air bubble of 0.2mm diameter situated just below the surface of water. (Surface tension of water = 0.072N/m)