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Surface charge density of soap bubble of...

Surface charge density of soap bubble of radius `r` and surface tension `T` is `sigma`.If `P` is excess pressure the value of `sigma` is

A

`epsilon_(0)[(4T)/(r)-P]^(3/2)`

B

`[2epsilon_(0)((4T)/(r)-P)]^(1/2)`

C

`(4T)/(r )`

D

`[4epsilon_(0)((2T)/(r)-P)]^(1/2)`

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