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  4. The excess pressure inside a soap bubble radius 4 cm is 30 dyne cm -2. The surface tension is

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Q. The excess pressure inside a soap bubble radius $4 \,cm$ is $30 $ dyne $cm ^{-2}$. The surface tension is

Solution:

$\Delta p=\frac{4 T}{R}$ for soap bubble
$30=\frac{4 \times T}{4}$
$T =30$ dyne $cm ^{-1}$