An isolated and charged spherical soap bubble has a radius \( r \) and the pressure inside is at...

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An isolated and charged spherical soap bubble has a radius \( r \) and the pressure inside is atmospheric. If \( T \) is the surface tension of soap solution, the charge on the drop is
(a) \( 2 \sqrt{\frac{2 r T}{\varepsilon_{0}}} \)
(b) \( 8 \pi r \sqrt{r T \varepsilon_{0}} \)
(c) \( 8 \pi r \sqrt{2 r T \varepsilon_{0}} \)
(d) \( 8 \pi r \sqrt{\frac{2 r T}{\varepsilon_{0}}} \)
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