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A soap bubble is slowly given a charge then
a) the radius increases slowly

b) the radius decreases slowly

c) the air pressure drops inside the bubble

d) the air pressure inside the bubble increases

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b, d are correct

a, c are correct

a, d are correct

b, c are correct

answer is A.

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Detailed Solution

Radius of bubble increases due to repulsion of charges.

$Δ P = \frac{2 T}{R} a n d Δ P \propto \frac{1}{R}$ If radius increases then pressure decreases

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