Magnets

Question 1

Describe the difference between a contact and a non-contact force

Answer 1

Contact force- objects have to touch. Non-contact force- acts from a distance

Question 2

State whether magnetism is a contact or a non-contact force

Answer 2

Non-contact

Question 3

Define the term ‘permanent magnet’

Answer 3

a material that produces its own magnetic field

Question 4

Define the term ‘induced magnet’

Answer 4

a material that becomes a magnet when it is placed in a magnetic field

Question 5

State the four magnetic materials

Answer 5

iron, steel, cobalt and nickel

Question 6

State what will happen when two like poles interact

Answer 6

repel

Question 7

State what will happen when two opposite poles interact

Answer 7

attract

Question 8

State where the magnetic force is strongest around a bar magnet

Answer 8

at the poles

Question 9

Explain why the magnetic field strength is greatest at the poles

Answer 9

there are more magnetic field lines and they are closer together

Question 10

Describe what a uniform magnetic field is.

Answer 10

same strength and same direction

Question 11

Explain why the earth has a magnetic field

Answer 11

the movement of iron in the liquid outer core

Question 12

Describe the shape of the Earth’s magnetic field

Answer 12

same as a bar magnet

Question 13

State what direction compasses point

Answer 13

geographic north but magnetic south

Question 14

Explain how compasses can be used as evidence for the Earth’s magnetic field

Answer 14

The compass needle points in the direction of the Earth’s magnetic field.