A soap bubble of radius 3 cm is charged with surface charge density σ such that σ2ϵ0=0.4SI units. The excess pressure inside the bubble in SI unit (surface tension of soap solution =3×10−3 N/m) is:
A
0.1
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B
0.2
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C
0.5
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D
0.25
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Solution
The correct option is B0.2
In a charged soap bubble surface tension T acts inward.