List of top Physics Questions on Coulomb’s Law

An electron is found to repel another electron at a distance of \(1\,\text{cm}\) with a force \(F=2.3\times10^{-24}\,\text{N}\). Two protons placed at a distance of \(5\,\text{cm}\) will
Two small insulating spheres are rubbed against each other and placed \(1\,\text{cm}\) apart. If they attract each other with a force \(F=0.1\,\text{N}\), the number of electrons that were transferred from one sphere to another during rubbing are nearly
Two point charges placed a distance d apart in vacuum exert a force of magnitude F on each other. One of the two charges is doubled. To keep the magnitude of force same the separation between the charges should be changed to
Two identical charged conducting spheres A and B have their centres separated by a certain distance. Charge on each sphere is \(q\) and the force of repulsion between them is \(F\). A third identical uncharged conducting sphere C is brought in contact with sphere A first and then with sphere B and finally removed from both. New force of repulsion between spheres A and B (Radius of A and B are negligible compared to the distance of separation so that they can be considered as point charges) is best given as:
What is the force between two small charged spheres having charges of \(2 × 10^{−7} C \) and \(3 × 10^{−7} C \) placed 30 cm apart in air?