Magnetism

Question 1

Define magnetism

Answer 1

The ability for a object to become a magnet

Question 2

Name the 4 materials that are naturally magnetic

Answer 2

Iron
Cobalt
Nickle
Steel

Question 3

How can we if a material is magnetic

Answer 3

If ht object is attracted to a magnet

Question 4

What are Domains ?

Answer 4

A magnetic domain is a region within a magnetic material in which the magnetisation is in a uniform direction.

Question 5

What is a bar magnet ?

Answer 5

Bar magnets are permanent magnets. This means that their magnetism is there all the time and cannot be turned on or off.

Question 6

What are the names of the two poles on a magnet ?

Answer 6

North and South

Question 7

What happens to a magnet when you put two north poles together ?

Answer 7

They repel

Question 8

What happens when you put a South pole and North pole together ?

Answer 8

They attract

Question 9

Define induced magnetism

Answer 9

The process by which a substance, such as iron or steel, becomes magnetised by a magnetic field

Question 10

Define electromagnetism

Answer 10

Creating a magnet using electricity

Question 11

Why are electromagnets useful ?

Answer 11

They can be turned on off

Question 12

What is repulsion ?

Answer 12

Repulsion is the test for a magnet because unmagnetised iron will be attracted to another magnet but it will not be repelled.

Question 13

What are the units of power

Answer 13

Watts

Question 14

What is a ferrous alloy ?

Answer 14

An alloy that contains iron

Question 15

Where is the strongest magnetic field around a bar magnet?

Answer 15

The strongest fields are found around the poles of a bar magnet.

Question 16

What is the name given to the attraction of unmagnetised iron to a magnet?

Answer 16

The attraction of unmagnetised iron to a magnet is called induced magnetism.

Question 17

What is another term for substances that can only be temporarily magnetised?

Answer 17

Substances that can only be temporarily magnetised are called soft

Question 18

Specifically in which direction do the lines run in a field diagram?

Answer 18

The lines run from north to south in a field diagram.

Question 19

What happens to the magnetic field around an electromagnet when the current is reversed?

Answer 19

When the current surrounding an electromagnet is reversed the current also reverses

Question 20

What do field line patterns show?

Answer 20

Field line patterns show both the direction and shape of a magnetic field.