Magnetism

Question 1

What are the 4 magnetic materials?

Answer 1

Iron, steel (Mostly iron), cobalt, nickel.

Question 2

What is a bar magnet?

Answer 2

A bar magnet is a permanent magnet. This means that its magnetism is there all the time and cannot be turned on or off.

Question 3

You can make an electromagnet stronger by doing these things:

Answer 3

wrapping the coil around a piece of iron (such as an iron nail)
adding more turns to the coil
increasing the current flowing through the coil
An iron core

Question 4

Electromagnets have some advantages over permanent magnets. For example:

Answer 4

they can be turned on and off

the strength of the magnetic field can be varied

Question 5

The arrow on magnetic field lines shows them flowing in which direction?

Answer 5

north to south

Question 6

What can we use to find the shape of a magnetic field?

Answer 6

A compass can be used to find the shape of a magnetic field.

Question 7

Where are the field lines most concentrated around a bar magnet?

Answer 7

For a bar magnet, the field lines are most concentrated at both poles.

Question 8

What is an induced magnet?

Answer 8

An induced magnet is a material that becomes a magnet when it is placed in a magnet field.

Question 9

What are magnetic fields?

Answer 9

A magnet creates a magnetic field around it. You cannot see a magnetic field, but you can observe its effects.