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Question

The excess of pressure inside a soap bubble than that of the outer pressure is

A
2Tr
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B
4Tr
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C
T2r
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D
Tr
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Solution

The correct option is B 4Tr
The pressure inside the bubble is more than outside. Inside pressure -outside pressure =excess pressure. In the case of bubble excess pressure = 4S/R. where s is the surface tension and r is the radius.

P=4Tr


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