Difficult
$A$ soap bubble (surface tension $= T$) is charged to a maximum surface density of charge $= \sigma$. When it is just about to burst,its radius $R$ is given by:
- A$R = \frac{\sigma^2}{8\varepsilon_0 T}$
- B$R = \frac{8\varepsilon_0 T}{\sigma^2}$
- C$R = \frac{\sigma}{\sqrt{8\varepsilon_0 T}}$
- D$R = \frac{\sqrt{8\varepsilon_0 T}}{\sigma}$
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