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APHY20104/21/23 1
20.6 Force between Two Parallel Wires
Wire #1 has a magnetic field
that produces a force on wire #2
d
IB o 11 2
221
2 2l
d
IIF o
APHY20104/21/23 2
20.7 Solenoids and Electromagnets
The magnetic field of the coil can be increased by adding an iron core.
l
INB o
APHY20104/21/23 3
20.9 Torque on a Current LoopTorque = (Force)(Lever Arm) = NIAB
sinθ
APHY20104/21/23 4
20.10 Applications
APHY20104/21/23 5
20.11 Mass Spectrometer
Determine a particle’s mass
Discovery of isotopes
E
rBqBm
APHY20104/21/23 6
20.12 Ferromagnetism
Magnetic domains: groups of aligned atoms
What do they look like?
The motion of electrons in atoms: orbiting and “spinning”
Most objects are non-magnetic since the electron motions are cancelled out by other electrons
Magnetic permeability B = Bo + BM
APHY20104/21/23 7
Determine the direction of the force on a positive charge.
APHY20104/21/23 8
Determine the direction of the velocity on a negative charge.
F
F
F
F