The electrostatic force between two point charges separated by a certain distance is 380 N. If the distance between the charges is doubled, what will be the new force?

Two electric dipoles of moments P and 27P are placed on a line with their centers 24 cm apart. Their dipole moments are directed opposite to each other. At what distance between the dipoles, from the center of the dipole of moment P, will the net electric field be zero?

A point charge q = 1 μC is located at a distance of 2 cm from one end of a thin insulating wire of length 10 cm having a charge Q = 24 μC, distributed uniformly along its length. The electrostatic force between q and the wire is _____ N. (Use 14πε0 = 9 × 109 N m2/C2)