PHY137H5 Lecture Notes - Lecture 2: Surface Charge, Bohr Model
Document Summary
Superconductors: the material has no resistance to electric current. These are very important because 30% of power from power generators is lost due to resistance. Electrons are transferred by rubbing the negatively charged rod on the metal sphere. When the rod is removed, the electrons distribute themselves over the surface of the sphere. The electrons repel each other until they are equidistant. If attracted or repulsed, the electrons inside an object may be polarized. The negatively charged rod induces a slight positive surface charge on the plastic. The positive and negative charges in the molecules separate slightly. The side of the paper closest to the comb now has a slight opposite charge. Coulomb"s law - coulomb found that there is a force between the positive and negative charges and wrote the theoretical equation for it: The electrostatic force is directed along the line joining the charges, and its direction (whether it attracts or repulses) depends on the charge signs.
