magnetism

what is magnetism

charged particles in motion

what is magnetic domain

an accumulation of many atomic magnets

how are magnetic materials usually

a non-magnetized state; domains in randon arrangements

whatt happens when domains align

the material is magnetized with a north to south orientation

what is the SI unit

tesla

how are magnets classified

natural, artificial permanent, electromagnets

what is a natural magnet

found in nature; earth, magnetite

what is a artificial permanent magnet

man made; hardened stee or alloy (alnico), compass

what is a electromagnet

temporary; created by a current of electrons and iron core, rad equipment relies on electromagnetics

what is magnetic permeability (susceptibility)

ease with which material can be magnetized

what is magnetic retentivity

ability of a material to hold magnetization

how are permeability and retentivity related

inversely related

what is ferromagnetic

materials that can be magnetized, exhibit strong magnetic properties, are strongly attracted to a magnet

what is paramagnetic

material that are only weakly attracted to a magnetic field, loosely influenced by a magnetic field

what is diamegnetic

materials are weakly repelled by a magnetic field, cannot be magnetized and not attracted to a magnet; most materials in the periodic table including cooper gold and silver

what is nonmagnetic

materials unaffected by a magnetic field

what is the first law of magnetism

every magnet has two poles, designated by North and South

what is the second law of magnetism

like poles repel, unlike poles attract

what is the third law of magnetism

analogous to coulomb’s law; the force between two magnetic poles varies directly as the strength of the poles and inversely as the square of the distance between the poles

what is the magnetic force field

lines of force; north to south on the outside of the magnetic and south to north on the inside of the magnet

where do field lines pass through

both magnetic and nonmagnetic materials; concentrated by magnetic unaffected by nonmagnetic