Download For the test over magnetism, you should know:

For the test over magnetism, you should know:
1. Who showed the connection between electricity and magnetism?
2. What is the magnetosphere?
3. What are magnetic domains and how are they oriented in non-magnetized and magnetized iron?
4. What does Lenz’s Law say about the direction of the induced current?
5. Name two similarities and one major difference between electric charges and magnetic poles
6. What is the shape of the magnetic field around a straight, current carrying wire?
7. What is a solenoid? What is the shape of its magnetic field?
8. What creates magnetic fields?
9. Do all electric charges have magnetic fields?
10. What are the units of magnetic flux density (magnetic field strength)?
11. Be able to use the curled fingers right hand rule to figure magnetic field direction for a straight wire
and a loop or coil or wire if you are given the direction of the current.
12. Be able to use the flat palm right hand rule to determine the direction of magnetic force on a moving
charge or current-carrying wire.
13. What energy conversion is taking place in motors?
14. What energy conversion is taking place in generators?
15. A bar magnet is used to induce a voltage in a solenoid. If the number of coils in the solenoid is
increased, what will be the effect on the induced voltage?
16. A bar magnet is used to induce a voltage in a solenoid. If the speed of the relative motion is
increased, what will be the effect on the induced voltage?
17. What is the function of the commutator in a dc motor or generator?
18. Draw the magnetic field for a simple bar magnet, a current carrying wire and a solenoid.
19. Draw the path of a charged particle (+ or -) in a region of a uniform magnetic field (into or out of the
page)
20. Calculate the secondary voltage of a transformer given the primary voltage and the number of turns
in the primary and secondary coils.
21. Calculate the primary current in the same transformer given the secondary current.
22. If a wire is carrying a current from left to tight across the page and a magnetic field is directed from
the top towards the bottom of the page, what will be the direction of magnetic force?
23. If a loop of wire is lying on the page and has a clockwise current, what will be the direction of its
magnetic field?
24. When a magnet picks up a piece of unmagnetized iron, what happens (magnetically) to the iron?
25. A transformer can increase the voltage in a circuit. Can it also increase the available energy or
power?