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In a cylinder-piston arrangement, air is under a pressure P_1.
A soap bubble of radius r lies inside the cylinder, soap bubble has
surface tension T. The radius of soap bubble is to be reduced to half,
The new pressure P_2 to which air should be compressed isothermally.
(Assume r is very small as compared to height of cylinder),d csyu&fiLVu mifLFkr gS rFkk;g P_1 nkc ij gSA blesa,d lkcqu dk cqycqyk ftldh mifLFkr gSA;fn
lkcqu ds cqycqys dh f= djuh gks rks] csyu
eku r csyu

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Isothermal process. ¼lerkih; çØe

Source: Grass-G / Ph-26 Physics paper 1 15 Jan.docx