Magnetism and Electromagnetism

Question 1

What is a magnetic field?

Answer 1

A region where other magnets and magnetic materials experience a non-contact force.

Question 2

In what direction do magnetic field lines point?

Answer 2

From North to South

Question 3

True or false? The force between two unlike poles is attractive.

Answer 3

True

Question 4

Describe the behaviour of a compass that is far away from a magnet.

Answer 4

Always points north.

Question 5

True or false? The force between a magnet and a magnetic material is always repulsive.

Answer 5

False

Question 6

Describe the magnetic field around a current-carrying wire.

Answer 6

Made up of concentric circles perpendicular to the wire.

Question 7

Why does adding more turns to a solenoid increase the strength of its magnetic field?

Answer 7

The field lines around each loop line up with each other. This results in lots of field lines pointing in the same direction, increasing the strength.

Question 8

What is an electromagnet?

Answer 8

A magnet whose magnetic field can be turned on and off with an electric current.

Question 9

Name two ways you could increase the force on a current carrying wire in a magnetic field.

Answer 9

Add an iron core.

Increase the coils of wire.