What is the cause of excess pressure inside a soap bubble?

What is the excess pressure in a soap bubble of radius 10 mm, if surface tension is 25 Xx 10^-2 N/m?

Calculate the excess of pressure in a soap bubble of radius 3xx10^-3 m surface tension of the soap solution is 20xx10^-3 N/m.

Derive an expression for excess of pressure in a liquid drop.

What is the work done in blowing soap bubble of radius 'r' and surface tension 'sigma' ?

Calculate the work done in blowing o soap bubble of radius 5 cm(surface tension of soap solution= 3xx10^-2 N/m).

What is the pressure inside the drop of mercury of radius 3.00 mm at room temperature? Surface tension of mercury at that temperature (20^@C) is 4.65 xx 10^-1 N m^-1 . The atmospheric pressure is 1.01 xx10^-5 Pa. Also give the excess pressure inside the drop.

What is the net electric flux through a closed surface surrounding an electric dipole? Derive the expressions for electric field intesity both inside and outside a uniformly charged spherical cell. What is the total enclosed by a closed surface if the electric flux entering and leaving the surface are 20000N/Cm^2 and 30000N/C m^2 respectively.