The surface tension of soap solution is 25×10−3 Nm−1. The excess pressure inside a soap bubble of diameter 1 cm is

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10 Pa

20 Pa

5 Pa

None of the above

answer is B.

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Detailed Solution

Excess pressure ΔP=4Tr=4×2×25×10−31×10−2=20N/m2=20Pa( as r=d/2)

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