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