Permanent and induced magnetism, magnetic forces and fields

What are the poles of a magnet?

The places where the magnetic forces are strongest.

What happens when two magnets are brought close together?

They exert a force on each other.

What do two like poles do?

Repel each other.

What do two unlike poles do?

Attract each other.

What is attraction and repulsion between two magnetic poles examples of?

Non-contact force.

What is a permanent magnet?

One that produces its own magnetic field.

What is an induced magnet?

A material that becomes a magnet when it is placed in a magnetic field. Induced magnetism always causes a force of attraction.

What happens when an induced magnet is removed from its magnetic field?

It loses most/all of its magnetism quickly.

What three metals are magnetic?

Iron, nickel and cobalt.

What is the magnetic field?

The region around a magnet where a force acts on another magnet or on a magnetic material (iron, steel, cobalt and nickel).

What is the force between a magnet and a magnetic material always going to be?

One of attraction.

What does the strength of the magnetic field depend on?

The distance from the magnet. The field is strongest at the poles of the magnet.

What is the direction of the magnetic field at any point given by?

The direction of the force that would act on another north pole placed at that point. The direction of a magnetic field line is from the north (seeking) pole of a magnet to the south(seeking) pole of the magnet.

What does a magnetic compass contain?

A small bar magnet. The Earth has a magnetic field. The compass needle points in the direction of the Earth’s magnetic field.