Magnets. Magnetic Force Force around a magnet that is felt before magnets touch.

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Presentation transcript:

Magnets

Magnetic Force Force around a magnet that is felt before magnets touch

Magnetic Field Area around a magnet that exerts a force of a moving charge

Magnetic Poles All magnets have a north and south pole Always found in pairs –Bar magnet –Horseshoe magnet –Disk magnet

Force of Attraction North to south poles

Force of Repulsion North to north or south to south. Poles do not touch

Magnets Are composed of iron, nickel, or cobalt Ferromagnetic materials are strongly attracted to magnets and can be made into magnets

Compass Needle Magnetized Points to north pole (which is south pole of magnet)

Earth’s Magnetic Field Near the Hudson Bay in Canada Different than the geographical north pole

Why is the Earth magnetic? Core is made of iron and nickel Earth behaves like a giant bar magnet buried deep within the Earth that exerts a magnetic force that surrounds it

The Earth’s magnetic poles reverse about every 500,000 years

Magnetic Domain Group of atoms with aligned magnetic poles

Electromagnets Electric current can cause magnetism Stronger the current, stronger the magnets