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Q.

An air bubble of radius 1 mm is formed inside water at a depth 10 m below free surface (where, air pressure is 105 Nm-2). The pressure inside the bubble is (surface tension of water = 7 X 10-2 Nm-1)

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a

2.0014×105Nm−2

b

2.14×105Nm−2

c

2.28×105Nm−2

d

2.0028×105Nm−2

answer is D.

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Detailed Solution

Pressure inside the bubble

= Pressure outside +2Tr=p0+ρgh+2Tr

=105+103×10×10+2×7×10−210−3

=2.0014×105Nm−2

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