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A soap bubble (surface tension \( =T \) ) is charged to a maximum surface density of charge \( =\sigma \). When it is just going to burst, its radius \( R \) is given by
(A) \( R=\frac{\sigma^{2}}{8 \pi_{0} T} \)
(B) \( R=8 \varepsilon_{0} \frac{T}{\sigma^{2}} \)
(C) \( R=\frac{\sigma}{\sqrt{8 E_{0} T}} \)
(D) \( R=\frac{\sqrt{8 \Sigma_{4} T}}{\sigma} \)
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