Magnetism

Question 1

What is magnetism?

Answer 1

Magnetism: an invisible force that pushes or pulls magnetic material.

Question 2

What is a magnet?

Answer 2

Amagnetis a material that produces a magnetic field.

Question 3

Which metals are magnetic?

Answer 3

Only iron (Fe), nickel (Ni) and cobalt (Co) are magnetic

Question 4

Are non-metals (e.g. wood and plastic) magnetic or non-magnetic?

Answer 4

Non-magnetic. They are not attracted by a magnet.

Question 5

What are the ends of a magnet called?

Answer 5

Poles (North pole and South pole)

Question 6

Opposite poles of magnets (N and S) will _____________.

Answer 6

Attract

Question 7

Like poles (e.g. N and N) of magnets will _____________.

Answer 7

Repel

Question 8

Permanent magnets are usually made from which material?

Answer 8

Steel

Question 9

Name 3 uses of a permanent magnet.

Answer 9

• Compasses
• Toys
• Fridge magnets
• School lab experiments etc

Question 10

What is an electromagnet?

Answer 10

Electromagnets use electricity to create a magnet from a current-carrying wire

Question 11

Name an advantage of an electromagnet.

Answer 11

They can be magnetised and demagnetised.
i.e. They can be switched on and off.

Question 12

Which metal is usually used to form an electromagnet?

Answer 12

Iron

Question 13

Why is iron use in electromagnets?

Answer 13

It can easily become a temporary magnet

Question 14

What are some uses of electromagnets?

Answer 14

• MRI scanners
• Speakers and earphones
• Sorting out recycled goods
• Mag-Lev trains
  etc

Question 15

Define the term ‘magnetic field’.

Answer 15

The region around a magnet where a force acts on another magnet or on a magnetic material (such as iron, steel, cobalt and nickel)

Question 16

What do magnetic field lines show us?

Answer 16

Magnetic field lines are used to represent the strength and direction of a magnetic field

Question 17

What are the rules when drawing magnetic field lines?

Answer 17

1) Always go from north to south (indicated by an arrow midway along the line).
2) Must never touch or cross other field lines.

Question 18

Where on a bar magnet is the magnetic field the strongest?

Answer 18

The magnetic field is strongest at the poles
This is where the magnetic field lines are closest together.

Question 19

What is a magnetic material?

Answer 19

A magnetic material is a material that is attracted to a magnet e.g. iron

Question 20

What is a non-magnetic material?

Answer 20

A substance that is not attracted to a magnet e.g. paper, wood, glass

Question 21

On Earth, the north arrow on a magnetic compass will point towards the geographic __________ Pole (in the Arctic Ocean)

Answer 21

North

Question 22

What is a permanent magnet?

Answer 22

Are magnets that produce their own magnetic field, can attract or repel other magnets.

Question 23

What is an induced magnet?

Answer 23

Materials that can become a magnet when placed in a magnetic field. Lose their magnetism when removed from a magnetic field.

Question 24

Where is the magnetic field the strongest?

Answer 24

The magnetic field isstrongest at the poles
This is where the magnetic field lines areclosesttogether.