A spherical drop of water has 1mm radius...

A spherical drop of water has `1mm` radius. If the surface tension of water is `70xx10^(-3)`N//m, then the difference of pressure between inside and outside of the spherical drop is:

A

`35 Nm^-2`

B

`70 Nm^-2`

C

`140 Nm^-2`

D

zero

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