PHYSICS 123
Fall 2002
Unit 3 – Amended Schedule
Magnetism & Electromagnetic Induction

Reading:                      Sections 20.0 - 20.6, 20.8 - 20.10, 20.12 - 20.15
Reading:                      Sections 21.0 - 21.10, 21.12

Homework:                 Chapter 20 - Questions 3,11,15,22
                                                         Problems 1,7,25,31,33,44,53    
                                                         Extra Credit: 62,64

                                    Chapter 21 - Problems 2,8,12,14

Dates:

• Reading Quiz (Chapter 20)................. Wednesday, October 9
• Reading Quiz (Chapter 21)..................Monday, October 21 
• Homework Due (Chap 20)................. Monday, October 21, by 5:00pm
• Homework Due (Chap 21)................. Friday, October 25, by 5:00pm
• Quiz Unit #3....................................... Friday, October 25

Homework may be turned in during class, or placed in the box outside of my office before 5:00 p.m.

SOME IMPORTANT CONCEPTS FROM CHAPTER 20:

What is the definition of a north pole and a south pole.  Which one points toward the geographic north pole of the earth?  How are magnetic fields produced?  Are magnetic fields and electric fields the same thing?  What units are used for magnetism?  What is the right hand rule?  What does the magnetic field produced from a straight wire carrying a current look like?  Which direction is the force on a wire when placed in a magnetic field?  What are three requirements for an object to feel a force in a magnetic field?  What possible paths will a charged particle follow when placed in a uniform magnetic field?  What is Ampère's law used for? Why does a loop of wire in a magnetic field feel a torque?  How does a mass spectrometer work?  What is ferromagnetism?

SOME IMPORTANT CONCEPTS FROM CHAPTER 21:

What is magnetic flux?  What is the SI unit of magnetic flux?  How can the magnetic flux be changed?  What are the results of a changing magnetic flux?  Is there also a similar result if the magnetic flux is not changing?  How does Lenz's law determine the direction of the induced emf?  What principle allows generators to work?  What principle is responsible for counter emf and eddy currents?  Are wires necessary to create induced currents? What does a transformer do?  What kind of current is required for a transformer to work?  What are some practical devices that use the principle of induction?  What is inductance?  What is the SI unit of inductance?  What is inductive reactance and capacitive reactance?  What causes them to change?  How does a capacitor in an ac circuit behave differently than a capacitor in a dc circuit?