PHYS-2210 Study Guide - Final Guide: Electric Dipole Moment, Electroscope, Purified Water
2 Apr 2016
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In our beginning studies in electricity, we can do a few experiments. Suppose we take two small glass objects and put them close together (but not touching). Apart from the tiny gravitational force they exert on each other, the objects experience essentially no force. Now, let"s rub both the objects with some silk and place them close together. Notice that the objects get a repulsive force (both objects feel a force) and these forces seem to obey newton"s third law, that is, the forces are equal in magnitude but opposite in direction. Now let"s try the same experiment by rubbing pieces of rubber or plastic with wool. Now let"s take a piece of glass (rubbed with silk) and put it next to a piece of rubber (rubbed with wool). Instead of a repulsive force, in this case we get an attractive force, which also still seems to obey newton"s third law.
