5.1 Simple Phenomena of Magnetism

Magnets
> e__ a f__ on another m__ or on magnetic mats
> __ attract; __ repel
> magnetic forces are bc of i__ between m__ f__

exert, force, magnet, opps, likes, interactions, magnetic fields

i__/s__ can be magnetised by s__,
OR placing in a s__ m__ f__ via e__

iron/steel, stroking, strong magnetic field, electromagnets

Magnetic material	Non-magnetic material
Material that a__ attr. to m__ & can be m__
e.g. i__, n__, c__, s__

are, magnets, magnetised, iron, nickel, cobalt, steel

Magnetic material	Non-magnetic material
	Material that a__ attr. to m__ & can’t be m__
	e.g. g__, p__, a__, w__

arent, magnets, magnetised, glass, plastic, aluminium, wood

Theory of magnetism explains:
> magnet 1/2ed = _ magnets
> magnets have a m__ s__
> magnets lose m__ when h__/ha__ (no longer l__ up)

2, max str, magnetism, heated, hammered, lined

Magnetic field

region where a magnetic pole experiences a force

Magnetic fields
> __ → __
> closer f__ l__ = str. m__ field
> use i__ f__ to see pattern

N, S, field line, magnetic, iron fillings

Induced Magnetism
> p__ magnets induce magnetism into a m__ material

permanent, magnetic

Earth
> geographic north pole = magnetic __
> geographic south pole = magnetic __

south, north

Electromagnets
> m__ caused by f__ of c__ in a c__

magnets, flow, current, coil

Electromagnets
> i__ c__ = incr. m__ field str
>> not using s__ bc it would be p__ magnetised

iron core, magnetic, steel, permanently

Electromagnets
incr. magnetic field str when:
> incr. c__
> incr. # of c__
> changing c__ material

current, coils, core

Demagnetising Magnets
> r__ orientation of i__ d__ in magnets
> occurs n__ over time

randomises, internal dipoles, naturally

Ways to demagnetise magnets
1. h__
2. he__ (beyond Curie temp)
3. applying a__ c__

hammering, heating, alternating current