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A soap bubble (surface tension = T) is charged to a maximum surface density of charge = σ. When it is just going to burst? Its radius R is given by

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By Expert Faculty of Sri Chaitanya
a
R=σ28ε0T
b
R=8ε0Tσ2
c
R=σ8ε0T
d
R=8ε0Tσ
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detailed solution

Correct option is B

The pressure due to surface tension =4TRThe pressure due to electrostatic forces =σ22ε0Just before the bubble bursts.4TR=σ22ε0  or  R=8Tε0σ2


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