Magnetism
¨the property of matter in which there is a force of attraction or repulsion between unlike and like poles¨
Types
Permanent
Temporary
Ex. Iron, cobalt, nickel
Rubbed to become magnets
Magnetic Domain
¨groups of atoms with aligned magnetic poles
Magnetic Field
¨has both a magnitude and a direction¨
Right hand rule
F = B X q X v
Electromagnets
¨change electrical energy to mechanical energy to do work and can be turned on and off by controlling the flow of current through the coil¨
B = F / (I X L)
¨Like poles repel, unlike poles attract¨
Monopole
Ferromagnetic: ¨strongly attracted to magnets¨
Diamagnetic: ¨repelled by magnets¨
Magnetic Domains: ¨tiny magnets within the magnet itself¨
Dipole