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A soap bubble is given a negative charge...

A soap bubble is given a negative charge, then its radius

A

increase

B

remains the same

C

decrease

D

fluctuate

Text Solution

Verified by Experts

The correct Answer is:
A
If `sigma` is the tension
`P_("excess") = (4 sigma)/(r)`
When bubble is charged
`P_("excess") = P_("electrostatic") + (4 sigma)/(r)`
`therefore` Surface tension will decrease and radius will increase.
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