michael lukie-magnetism eco kids 2011

8/18/2019 Michael Lukie-Magnetism ECO Kids 2011

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1University of Winnipeg ECO Kids 2011


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William Gilbert an

English physician firstproposed in 1600 that theearth itself is a magnet

and he predicted that theEarth would be found tohave magnetic poles.



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The ends of a magnet are where the magnetic effectis the strongest. These are called “poles.” Eachmagnet has 2 poles – 1 north, 1 south.



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Like repels like…

Opposites attract!



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Poles of a magnet alwaysCome in pairs!



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If you cut a magnet in half,

you get 2 magnets



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Atoms themselves have magnetic properties dueto the spin of the atom’s electrons.

These areas of atoms are called “domains”

Groups of atoms join so that their magnetic fieldsare all going in the same direction



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W h e n a n u n m a g n e ti ze d su b s ta n c e i s p la c ed in a m a g n e ti cf i el d th e su b sta n c e c a n b e c o m e m a g n e ti ze d .

T h i s h a p p e n s wh e n th e sp i n n i n g e l ec tro n s l in e u p i n th esa m e d ir ec ti o n .



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An unmagnetized substance

looks like this…



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While a magnetized substance lookslike this…



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The Earth is a magnet:Magnetic South Pole

Magnetic North Pole

It exerts magnetic forcesand is surrounded by a

magnetic field that isstrongest near theNorth and Southmagnetic poles

Geographic North Pole

Geographic South Pole



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Sometimes, theEarth’smagnetic polesflip. Thishappens everyhalf-millionyears or so.

Magnetic North Pole

Magnetic South Pole



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We use the Earth’s magnetic

field to find direction.

The needle of a compass always pointstoward the magnetic south pole.

We call this direction “North” (remember, opposites attract)



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The sun has a magneticfield, too. It extends farabove the sun s surface.

Other planets in thesolar system also havethese magnetic fields



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When a charged particle enters a magneticfield an electric force is exerted on it. If a

charged particle moves at an angle to amagnetic field the magnetic force acting on itwill cause it to move in a spiral around themagnetic field lines .



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The solar wind is constantly bombarding theEarth’s magnetic field. Sometimes these chargedparticles penetrate that field. These particles arefound in two large regions known as the VanAllen Belts.



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"Mr.Lukie, may I be excused? My brain is full!!!

michael lukie-magnetism eco kids 2011

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