Download Chapter 22-23 Test Review Chapter Summary 22.1. Magnets

Chapter 22-23 Test Review
Chapter Summary
22.1. Magnets
• Describe the difference between the north and south poles of a magnet.
• Describe how magnetic poles interact with each other.
22.2. Ferromagnets and Electromagnets
• Define ferromagnet.
• Describe the role of magnetic domains in magnetization.
• Explain the significance of the Curie temperature.
• Describe the relationship between electricity and magnetism.
22.3. Magnetic Fields and Magnetic Field Lines
• Define magnetic field and describe the magnetic field lines of various magnetic
fields.
22.4. Magnetic Field Strength: Force on a Moving Charge in a Magnetic Field
• Describe the effects of magnetic fields on moving charges.
• Use the right hand rule 1 to determine the velocity of a charge, the direction of
the magnetic field, and the direction of the magnetic force on a moving charge.
• Calculate the magnetic force on a moving charge.
22.5. Force on a Moving Charge in a Magnetic Field
• Describe the effects of a magnetic field on a moving charge.
• Calculate the radius of curvature of the path of a charge that is moving in a
magnetic field.
22.7. Magnetic Force on a Current-Carrying Conductor
• Describe the effects of a magnetic force on a current-carrying conductor.
• Calculate the magnetic force on a current-carrying conductor.
22.8. Torque on a Current Loop: Motors and Meters
• Describe how motors and meters work in terms of torque on a current loop.
• Calculate the torque on a current-carrying loop in a magnetic field.
23.1. Induced Emf and Magnetic Flux
• Calculate the flux of a uniform magnetic field through a loop of arbitrary
orientation.
• Describe methods to produce an electromotive force (emf) with a magnetic field
or magnet and a loop of wire.
23.2. Faraday’s Law of Induction
• Calculate emf, current, and magnetic fields using Faraday’s Law.
23.5. Electric Generators
• Calculate the emf induced in a generator.
• Calculate the peak emf which can be induced in a particular generator system.
23.7. Transformers
• Explain how a transformer works.
• Calculate voltage, current, and/or number of turns given the other quantities.
Key Equations

 
F  qv x B
 F = qvB sin 
Direction of F determined by the right hand rule

 
F  IL x B
 F = ILB sin 
Direction of F determined by the right hand rule
Direction of B determined by the 2nd right hand rule
Long straight wire:
Flux and emf:
Transformers:
mv 2
r
 T 
2r 2m

v
qB
B = BA cos 
emf = N
 B
t
emf = NBA sin t
emfmax = NBA
 B 
 B 

 
 
 t p  t  s
Vs =
Circulating charge: qvB 
 r
mv
qB
emf = IR (V = IR)
Ns
Vp
Np
Multiple Choice (Approx 15-20)

Units for the parameters in the key equations and key terms

Direction of a magnetic field from a magnet knowing north and south poles

Direction of the magnetic field of the Earth

Find direction of F, v or B

Find direction of F, I or B

Definition of ferromagnets, domains and electromagnets

Determine r of a charged particle moving in a magnetic field

Determine torque on a coil in a magnetic field

Relationship between emf and flux

Faraday’s Law

Understand what generators and transformers do

Key ideas from chapter summary above and section summaries in text
Problems (Approx 5-8)
 Notes and practice problems in class