P4

Question 1

What do field lines represent?

Answer 1

Field lines represent magnetic flux and magnetic flux density (The number of lines passing through a particular area)

Question 2

What does the density of the field lines show you?

Answer 2

The strength of a magnetic field

Question 3

What is an induced magnet

Answer 3

A magnet that is produced when a magnetic material is placed in a magnetic field

Question 4

Why do compasses point north?

Answer 4

If you hang up a magnet, it will line up so that one end points towards the magnetic North Pole.

Question 5

What is the magnetic field around a wire?

Answer 5

There is a magnetic field around a wire that is carrying a current. If the current is coming towards you, the field lines were anti-clockwise

Question 6

If the current is coming towards you…

Answer 6

The field lines were anti-clockwise

Question 7

What is the strength of a magnetic field measured in?

Answer 7

The strength of a magnetic field is measured in Tesla’s (T)

Question 8

What is a solenoid?

Answer 8

It is a coil of wire. A coil is made from many parallel loops.

Question 9

How can you make a field/ a solenoid stronger?

Answer 9

Adding a magnetic material inside the core

Increasing the number of coils