circuits

1. Superconductors are materials which, when cooled sufficiently, offer almost no resistance to electrical current. The copper wires in your circuits do, however, add to the total resistance. a) What if the wires used in the circuit with the light bulb were replaced with superconducting wires and the resistance became almost nothing? Would the current in the circuit change, or the does voltage change, or both? b) What would happen to the light bulb? Explain your answer using Ohm's law.

Magnetic Induction

1. What, if anything, happens to the charges inside a coil of wire when a magnet moves through the coil? What happens to the charges if the magnet is close to the coil but not moving?
2. Does the same thing happen to the charges if you move the North end of a magnet toward a coil of wire as when you move the South end toward the coil? Explain your reasoning. Does the speed at which the magnet moves make a difference?
3. What happens to charges in the wire if you hold the permanent magnet stationary and move the coil?