Two ping pong balls, 1 and 2 , are charged uniformly such that ball 1 gets \(0.5 \mathrm{nC}\) charge and ball 2 gets \(-0.5 \mathrm{nC}\) charge. Calculate the ratio of the magnitudes of the dipole moments produced if they were stuck to the opposite ends of the two sticks of length \(200 \mathrm{~mm}\) and \(400 \mathrm{~mm}\).