Assignment #7: Magnetism 1. A compass needle is not always balanced parallel to the surface of the earth. The needle may sink downward or backward while searching find the balance. explain this phenomenon.

2. Explain why Earth's "north pole" is really a magnetic south pole. State how the north and south magnetic poles were defined and how we can tell experimentally that the north pole is really a south magnetic pole.

3. Indicate which of the following will produce a magnetic field:

to. A magnet. b. The earth. c. An electrical charge at rest. d. A moving electric charge. and. An electric current. F. The voltage from a battery is not connected to anything. g. An ordinary piece of iron. h. A piece of any metal.

4. The magnetic field due to current in the wires in your house can affect a compass. Discuss the effect in terms of currents, even if they are DC or AC