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Question

Physics Question on Surface tension

The surface tension of a soap solution is 25×10−3 N/m25 \times 10^{-3}\,N/m. The excess pressure inside a soap bubble of diameter 1 cm is

A

5 pa

B

10 pa

C

20 pa

D

40 pa

Answer

20 pa

Explanation

Solution

ΔP=4Tr\Delta P = \frac{4T}{r}