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Flashcards in Magnetism Deck (20)
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1

Define magnetism

The ability for a object to become a magnet

2

Name the 4 materials that are naturally magnetic

Iron
Cobalt
Nickle
Steel

3

How can we if a material is magnetic

If ht object is attracted to a magnet

4

What are Domains ?

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

5

What is a bar magnet ?

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

6

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

North and South

7

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

They repel

8

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

They attract

9

Define induced magnetism

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

10

Define electromagnetism

Creating a magnet using electricity

11

Why are electromagnets useful ?

They can be turned on off

12

What is repulsion ?

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

13

What are the units of power

Watts

14

What is a ferrous alloy ?

An alloy that contains iron

15

Where is the strongest magnetic field around a bar magnet?

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

16

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

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

17

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

Substances that can only be temporarily magnetised are called soft

18

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

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

19

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

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

20

What do field line patterns show?

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