Difficult
$A$ spherical drop of water has a radius of $1\, mm$. If the surface tension of water is $70 \times 10^{-3} \, N/m$,then the difference of pressure between the inside and outside of the spherical drop is:
- A$140 \, N/m^2$
- B$40 \, N/m$
- C$35 \, N/m^2$
- DNone of these
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