﻿ Magnetism Quiz

Magnetism Quiz:

1. True or false:  all magnetism involves motions of electric charge. [answer at bottom]
2. Magnetic Field Lines:
1. Draw magnetic field lines (or show the direction of the magnetic field, B), as they relate to N and S poles of magnets.
2. Show/explain how magnetic field lines look different around stronger or weaker magnets.
3. Show how magnets stick together, based on their polarity.
4. Explain why, when considered as a magnet, the Earth's North Pole is really a south pole.
5. When an iron-containing object is brought near a permanent magnet (with poles labeled), label the temporary magnetic poles in the object.
6. Know the symbol for magnetic field.
7. Right Hand Rules
1. Right Hand Rule with curled fingers (B and I only)
1. Know how to find the directions of B and I
2. Given the direction of current flowing through a solenoid, determine the direction of the solenoid's magnetic field.
3. Given the direction of a solenoid's magnetic field, determine the direction of current flowing through the solenoid.
2. Right Hand Rule with straight fingers (B, I, and F)
1. Know how to find the directions of B, I, and F
2. Given the directions of current and magnetic field on a piece of paper, determine whether the force exerted on the moving charge is into the paper or out of the paper.
8. Lenz' Law:
1. Be able to describe Lenz' Law.
2. Given a magnet (with N and S labeled) that is moving near a coil...
1. Describe the direction of the magnet's field.
2. Determine whether the flux of that field through the coil is increasing or decreasing.
3. Identify the direction of the new magnetic field that will form in response to this change in flux (from part 2).
4. Identify the direction of the current that produces this new magnetic field (using the curled finger RHR).
9. Know how to build a solenoid buzzer.   You will be given a picture of a buzzer that is not working, and you will have to explain how to fix it.  You may have to explain why it isn't working.
10. Understand and be able to explain how a motor works.  You will not have to determine which way a motor will move.
11. Understand and be able to explain how a generator works.  You will not have to determine which way the current will travel.
12. Understand and be able to explain how a speaker works as a motor.
13. Understand and be able to explain how a magnetic pickup works as a generator.
14. Determine the voltage output from a transformer, based on the numbers of turns in the input and output coils