Magnetism

Magnetism

The force of attraction or repulsion between poles

Repel

Like poles _______.

Two new magnets are formed, each with its own north and south poles.

What happens when you break a magnet?

Attract

Opposite poles ______.

Magnetic Field

Area around magnets where magnetic forces act

…the magnet’s magnetic field

Field lines around a magnet show _____.

North to South

What direction do magnetic field lines travel in? (North → South / South → North)

Magnetic Domain

An area within magnetic material where all the atoms are lined up in the same direction.

No

Is this an example of magnetized material?

Yes

Is this an example of magnetized material?

Permanent Magents

Materials whose magnetic domains are naturally aligned in the same direction.

Examples:

• Bar Magnet

• Earth

Temporary Magnets

Materials that are not magnetic but can be temporarily magnetic by forcing its atoms into alignment.

Electromagnet

A strong, temporary magnet formed when a current passes through wire coiled around an iron core.

Electromagnet

What type of electromagnet is this?

Solenoid

What type of electromagnet is this?

Solenoid

A temporary magnet formed when current is passed through wire that is NOT coiled around an iron core. (1000 times weaker than an electromagnet)

Ferromagnets

1000 times stronger than electromagnets. (Electromagnets on steroids as Mr. Siberski calls them.)

• Increase the number of coils

• Increase the voltage source

What are two ways to increase the strength of the electromagnet?

Swap the wires on the battery ends

How do you swap the poles of an electromagnet?