The force exerted by surface tension on the free surface

The force required to separate two glass plates of area ${10}^{-2}{\mathrm{m}}^2$ with a film of water $0.05\mathrm{mm}$ thick between them, is (Surface tension of water is $\left.70\times {10}^{-3}\mathrm{N} {\mathrm{m}}^{-1} \right)$ 

A liquid is contained in a vertical tube of semicircular cross-section as shown in figure. If the angle of contact is zero, then the ratio of the force of surface tension on flat side to curved side of the tube will be

A thin liquid film formed between a U-shaped wire and a light slider supports a weight of $1.5\times {10}^{-2}\mathrm{N}$ (See figure). The length of the slider is $30\mathrm{cm}$ and its weight negligible. The surface tension of the liquid film is 

A metal wire of density '$\rho$' floats on water surface horizontally. If it is not to sink in water then maximum radius of wire is proportional to $(\mathrm{T}$ is the surface tension of water, $g$ is the gravitational acceleration) 

Two drops of a liquid are merged to form a single drop. In this process, 

Two spherical soap bubbles of radii $r_1$ and $r_2$ in vacuum coalesce under isothermal conditions. The resulting bubble has the radius R such that

The work done in breaking a big drop of radius $R$ in $n$ droplets of equal radii is $(T$ is surface tension $)$