Q.

Excess pressure can be (2T/R) for

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a

spherical meniscus

b

spherical drop

c

spherical bubble in water

d

cylindrical bubble in air

answer is A, B, C, D.

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Detailed Solution

i. Excess pressure inside a spherical liquid drop 2T/ R because there is only one free surface here 

ii. In case of spherical meniscus of radius of curvaure R, also excess pressure =2 T / R because in  this case there is only one free surface 

iii. Excess pressure inside a cylindrical drop of radius R=T / R, Hence, for a cylindrical bubble in air, excess pressure is 2 T/R, because there exist two free surface in this case 

iv. For a spherical bubble in water, excess pressure =2T / R, as there is only one free surface. Hence, all the four optional are correct.

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