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Q.

Which of the following statements are not correct about soap bubble?

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a

Pressure inside a bubble is lesser than outside it

b

Work done in forming the bubble of radius ‘R’ and surface tension T is 4πR2T.

c

Work done in doubling the radius of bubble of radius R and surface tension is 24πR2T

d

Pressure inside a bubble is greater than inside a drop of the same radius and of the same liquid

answer is A, D.

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Detailed Solution

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W.D informs a soap bubble of radius
w=T×DT=T×2×4πR2=8πR2T
W.D in doubling the radius of a soap bubble
w=w2w1=T×2×4π(2R)28πR2T
               =24πR2T       
Excess pressure inside a soap bubble p=4TR
 

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