Two identical tiny metal balls carry charges of +3nC and -12nC. They are 3m apart. (a) Compute the force of attraction. (b) The balls are now touched together and then separated to 3cm. Describe the forces on them now.
The interaction between charged objects is a non-contact force that acts over some distance of separation. Charge, charge and distance. Every electrical interaction involves a force that highlights the importance of these three variables.
