magnetism. property of magnets we say that unlike poles attract, and like poles repel

Magnetism

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Magnetic field Magnets create magnetic fields. These cannot be seen. They are the space around a magnet over which it has a magnetic effect.

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Magnetism

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Property of Magnets

• We say that unlike poles attract, and like poles repel.

Magnetic field• Magnets create

magnetic fields.

• These cannot be seen.

• They are the space around a magnet over which it has a magnetic effect.

Page 4: Magnetism. Property of Magnets We say that unlike poles attract, and like poles repel

Distinguish between:

a magnet

a magnetic material

a non magnetic material?

Produces a magnetic field

Reacts to a magnetic field

Doesn’t react to a magnetic field

Page 5: Magnetism. Property of Magnets We say that unlike poles attract, and like poles repel

To investigate the magnetic field of a magnet and plot it.

• Small compasses called plotting compasses can be used to show the magnetic field around a bar magnet

• When plotting compasses are put around a bar magnet, the needles point away from the magnet's north pole and towards its south pole.

Page 6: Magnetism. Property of Magnets We say that unlike poles attract, and like poles repel

To investigate the magnetic field of a magnet and plot it

• Put a plotting compass on the north pole of the magnet• With a pencil mark the positions of both ends of the needle of the plotting compass• Move the compass so that the south pole on the compass is now at the point

where the north pole was.• Continue this until you reach the south pole.• Join the dots

Page 7: Magnetism. Property of Magnets We say that unlike poles attract, and like poles repel

weakest field further away from poles

N S

Strength of a magnetic field

strongest field

at poles

strongest field

at poles

Page 8: Magnetism. Property of Magnets We say that unlike poles attract, and like poles repel

The magnetic field of a bar magnet

Page 9: Magnetism. Property of Magnets We say that unlike poles attract, and like poles repel

NNS S

Magnetic field pattern: N poles together

What do you notice about the pattern of the lines of force in the region between the two north poles?

Page 10: Magnetism. Property of Magnets We say that unlike poles attract, and like poles repel

The earths magnetic fieldThe Earth does not contain a giant bar magnet, but it

behaves as if it does.

The Earth has a magnetic pole in the north and one in the south.

Page 11: Magnetism. Property of Magnets We say that unlike poles attract, and like poles repel

How a compass works• The small magnet inside a compass feels

the earths magnetic force and always points toward the south magnetic pole of the earth ( but we call it the north pole!)

Page 12: Magnetism. Property of Magnets We say that unlike poles attract, and like poles repel

Uses of magnetsThe Maglev Trains in Japan use magnetic repulsion to train to “float” above the track

Page 13: Magnetism. Property of Magnets We say that unlike poles attract, and like poles repel

Magnets used to sort metal in a ship yard

Page 14: Magnetism. Property of Magnets We say that unlike poles attract, and like poles repel

Orienteering

• A magnetic compass helps us in direction finding.

• Compasses always points towards north pole ( but this is actually the south magnetic pole )

Page 15: Magnetism. Property of Magnets We say that unlike poles attract, and like poles repel

Do you know…1. How magnets behave when they come into contact

with each other

2. What a magnetic field is

3. How to plot the magnetic field of a magnet

4. How a compass works

5. Some uses of magnetic fields

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