P4.1.1 - Magnets And Magnetic Field

Question 1

What do magnetic field lines represent?

Answer 1

Magnetic flux

Question 2

What is magnetic flux density?

Answer 2

The number of magnetic field lines within in an area

Question 3

What is an induced magnet?

Answer 3

An object which is attracted to a magnet but isn’t a permanent magnet

Question 4

What is a permanent magnet?

Answer 4

A magnet that always attracts other magnets

Question 5

Describe the domains in a permanent magnet

Answer 5

In a permanent magnet, the domains are always lined up, which shows that they are always magnetised

Question 6

Describe the domains in an induced magnet

Answer 6

In an induced magnet, the domains are not all lined up, but they do line up when in another magnetic field. In some hard objects the domains stay like this but in soft objects they go back to normal

Question 7

State examples of materials that have domains which line up when in a magnetic field

Answer 7

Steel, iron

Question 8

What does the compass point to?

Answer 8

The magnetic North Pole