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^{a 11139} substance

Amagnetlsa _wacts._ron.

_or an ^ob'^ectaround a magnet,

(c) 2011 Dorling Kindersley. Ali Rights Reserved.

The reg'°^{n a}’^_r forces act,

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Why do . magnets stick

to fridges?

Fridge magnets stick to fridges because magnets stick to Steel . . . and fridges are madę of Steel. Magnets can do a lot morę than just stick cartoon characters on a fridge door, though. Many things that we use every day would not work without magnets —and if Earth itself were not magnetic, we’d be in trouble!

Ten things that

use magnetism

Magnets eiefomdtototsof

_eveiyday ttang _uter oi its

Sr™""*—

P^nnie ’,, _hnne battery, oi

remacat,P»ane«_tIain. youreusing magnets. Miciophones y/ Loudspeabets

y/ Electric motots

y/ Electiomagnets y/ Transformers

✓    Generatots

✓    Coinpntei disk diives

✓    Compasses

y/ Power supplies y/ Battery criargers

Tell me morę: inside a magnet

If you could look inside a magnet, you would see tiny regions called domains. Inside each domain, all the magnetic particles of matter are lined up in the same direction.

How to: see a magnetic field

Unmagnetized

iron

Magnetic domains point in different directions

01: In an unmagnetized piece of iron, the domains point in different directions. Their magnetic forces cancel each other out.

1 ■ Align two magnets, poles opposing, on a sheet of cardboard.
	. a ■ ■

02 ■ Sprinkleiron filings on the card.

Unmagnetized

iron

Magnetic domains linę up in the same direction

02. When the iron is magnetized, the domains point in the same direction and their magnetic forces add together.