Physics Department
PHYS 1P22/92
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Magnetism
Introduction
Electrostatics
Electric circuits
Magnetism, induction, electromagnetic fields
Magnetic forces and magnetic fields
field of a bar magnet
magnetic field lines
start at "N", end at "S"
there are
no
magnetic monopoles
Ex:
uniform magnetic field
Ex:
Earth's magnetic field
; North
vs.
"N"
Magnetic materials,
ferromagnetism
Magnetic force on a moving charge
magnitude: \( F=qvB\sin\phi \)
direction:
the right-hand rule
Ex:
magnetic force 1
Ex:
magnetic force 2
Ex:
magnetic force 3
Ex:
magnetic force 4
Motion of charged particles in constant magnetic fields
Bubble Chambers
Ex:
uniform circular motion
aurora borealis
Ex:
the solar wind
engineering applications
television
Ex:
mass-spectrometer
Ex:
alpha particles in B field
Magnetic force on an electric current
Ex:
magnetic force on a current
Ex:
magnetohydrodynamic drive
Ex:
loudspeaker
Ex:
electric train using the Earth's magnetic field
Force on a loop of current
magnetic moment of a coil
DC electric motor
Magnetic fields produced by electric currents
a long straight wire
Ex:
health effects of the em radiation from transmission lines, etc.
magnetic field of
a loop
;
a solenoid
two wires exert forces on each other
Ex:
solenoid
Ex:
a flexible loop
Ex:
a hairpin current
Ex:
magnetic field at the center of a loop
Ex:
forces on loop
Electromagnetic induction
magnetic flux
\( \Phi = BA \cos\phi \)
Ex:
calculating flux
current induced by a changing magnetic flux
changing the area:
a moving rod
,
a shape distortion
Ex:
a shrinking loop
changing the angle
changing magnetic field
Ex:
ground-fault detection
Ex:
a moving-coil microphone
Ex:
an electric guitar pick-up coil
Ex:
magnetic tape playback
Ex:
magnetic flux
Ex:
change in flux
Ex:
faraday's law
Lenz's law:
induced emf opposes changes in flux
Ex:
Lenz's Law 1
Ex:
Lenz's Law 2
Ex:
Lenz's Law 3
Ex:
non-conductors/broken circuits
motional emf
Ex:
tethered satellite experiment
generators
Ex:
back-emf of an electric motor
transformers
two coils share the same flux
iron core "concentrates" the field lines
Ex:
reducing power losses in transmission lines
self-inductance
Maxwell's equations: electricity & magnetism unified;
electromagnetic wave
Light and Optics
Quantum Physics
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St. Catharines, Ontario, L2S 3A1
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ext.
3412
Email:
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Fax: +1.905.984-4857
[Disclaimer]
Updated: 02-Aug-2022 14:38
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