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The radius of a soap bubble is 5 mm. Wha...

The radius of a soap bubble is 5 mm. What charge should be imparted to it to make it begin to swell?

Text Solution

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The electrical forces extending the film must exceed the surface tension forces:
`(q^(2))/(32 pi^(2)epsi_(0)R^(4)) ge (4 sigma)/(R)`
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