Two equal balls with equal positive charge q coulombs are suspended by two insuulating strings of equal length. What would be the effect on the force when a plastic sheet is ineserted between the two?

If the distance between two equal points charges is doubled and their individual charges are also doubled, what would happen to the force between them?

A rectangular frame is to be suspended symmetrically by two strings of equal length on two supports (Shown in the figure) It can be done in one of the following three ways:

Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle 30^@ with each other. When suspended in a liquid of density 800 kg m^-3 , the angle remains the same. Wahat is the dielectric constant of the liquid? The density of the material of the sphere is 1600 kg m^-3

Two spheres of equal radius r are touching each other. The force of attra tion between them is proportional to

Find the ratio of resistances when two heater wires of equal lengths are first connected is series and then in parallel.