(Answered) A soap bubble hanging from the end of an open tube

Engineering

A soap bubble hanging from the end of an open tube contracts under the action of its surface tension (the coefficient of surface tension is gamma). Assuming that the dielectric strength of air, i.e. the field strength at which breakdown occurs, is E_0, investigate whether the contraction may be prevented by placing a large charge on the bubble. What is the minimum equilibrium radius R of the bubble?

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