Physics Magnetism test

Name the two poles of a magnet.

North and south

Opposite poles...

Attract

Like poles...

Repel

North poles repel...

North poles

North poles attract...

South poles

South poles repel...

South poles

South poles attract...

North poles

Is iron magnetic?

Yes

Define magnetic field

Area surrounding a magnet that can exert a force on magnetic materials.

How many poles does a bar magnet have?

Two

Where is a magnetic field strongest?

A magnetic field is strongest where the field lines are closest.

In which direction are the arrows on a magnetic field line?

From north to south

Why does the Earth have a magnetic field?

The Earth's core is magnetic

Define magnetically hard

Substances that can be permanently magnetised

Define magnetically soft

Substances that can only be magnetised temporarily

What is an electromagnet?

A magnet made by wrapping a coil of wire around an iron bar

What type of magnet is used to lift a train?

Electromagnet

What direction does a freely moving magnet point?

North-south

How do you test if an item is a permanent magnet?

If it repels other magnets

The bigger the current of an electromagnet, the ______

stronger the field

The bigger the number of turns of an electromagnet, the ________

stronger the field

The stronger the magnetic field, the ________ the field lines

closer