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I was wondering if 2 unlike charges are placed a certain distance d apart, they will attract and move towards each other and the attractive force is given by Coulomb's kq1q2/r^2. Since r cannot be equals to zero as it would imply that the 2 charges exist as the same point in space, there has to be a closest approach of some kind. What then happens when distance r between these 2 charges are extremely close to 0?? Correct me if my reasoning is flawed. Thanks!