electrostatics Questions

Polar molecules are the molecules:

The equivalent capacitance of the combination shown in the figure is:

Two charged spherical conductors of radius $R_1$ and $R_2$ are connected by a wire. Then the ratio of surface charge densities of the sphere $({\sigma }_1/{\sigma }_2)$ is:

A parallel plate capacitor has a uniform electric field $\vec{E}$ in the space between the plates. If the distance between the plates is $d$ and the area of each plate is $A$, the energy stored in the capacitor is: (${ϵ}_0=\text{permittivity of free space}$)

A dipole is placed in an electric field as shown. In which direction will it move?

Twenty seven drops of same size are charged at $220\text{V}$ each. They combine to form a bigger drop. Calculate the potential of the bigger drop.