An isolated soap bubble is kept in a container in which the pressure is maintained at Po. The bubble is given some charge due to which its radius increases to 
and the pressure inside the bubble reduces to Po. If the surface tension of the soap bubble is T , then the charge given to the bubble is
Text Solution
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The excess pressure inside a soap bubble due to surface tension is 
.
In the given problem the pressure of the air inside and outside the bubble is the same, hence the excess pressure in this situation should be due to the electrostatic pressure.
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