# Magnetic Fields

In this worksheet, students will explain the shape, size and direction of magnetic fields, how the magnetic field can be seen and magnetic field lines.

Key stage:  KS 3

Curriculum topic:   Physics: Electricity and Electromagnetism

Curriculum subtopic:   Magnetism

Difficulty level:

### QUESTION 1 of 10

A magnetic field is the area around a magnet where the magnetic force creates a magnetic effect. It is stronger at the poles of the magnet. Magnetic objects placed within a magnetic field would be affected in two ways: a magnetic material would always be attracted to the magnet, whereas another magnet could be attracted or repelled.

A magnetic field can be shown when placing small shavings of iron - iron filings - near a magnet. They arrange themselves in such a way that they show the magnetic field (see diagram below). Each iron filing becomes a small magnet and is attracted more strongly to the poles of the magnet.

A magnetic field can also be shown by drawing magnetic field lines. These lines would be shown by the iron filings as they line up along the field lines. The direction of the magnetic field is the same as the direction of the lines and the less space between the lines, the stronger the magnetic field. Different types of magnets produce different arrangements of magnetic field lines.

The diagram below shows an example of magnetic field lines, the Earth’s magnetic field, as the Earth acts as a giant bar magnet:

The Earth behaves as if it has a large permanent magnet at its centre; that’s why a compass needle always points North/South. It is attracted to the Earth’s geographical North pole.

The Earth’s magnetic field protects us from cosmic rays and solar wind, making life on Earth possible. The Earth’s centre has a dense fluid outer core and a solid inner core, both of which are high in iron-rich materials.  Aurora Borealis (the Northern Lights) are charged particles from the Sun attracted by the Earth’s magnetic poles. The Earth’s magnetic field extends into space and forms the magnetosphere.

In the answer box below, write the two words which complete this sentence:

A magnetic field is the area around a magnet where the ________ _______ creates an effect.

In the answer box below, write the word which completes this sentence:

A magnetic material would always be _______________ to a magnet.

In the boxes in the table below, write the words that replace A and B in the gaps in the following sentence:

A magnet can be _______A_______ to or _______B_______ by another magnet.

 Missing Words A B

Select the correct option from the list below to complete this sentence:

A magnetic field can be shown using....

a magnet

iron filings

magnesium ribbon

an iron bar

What is the best way to demonstrate the magnetic field of a magnetic object?

drawing magnetic field lines

an iron nail

cocoa powder

a steel bar

Select TWO options from the list below to complete the following sentence:

The direction of the magnetic field lines.........

is always the same as the direction of the magnetic field.

change continuously.

is the same throughout the magnetic field.

is different at different parts of the magnetic field.

Is the following statement true or false?

The Earth’s core is high in non-magnetic materials.

true

false

In the answer box below, write the two words that complete this sentence:

The Earth’s core is high in ______-______ materials.

Select two options from the list below which complete the following sentence:

The Aurora Borealis is created because of.....

sun gas particles attracted by the Earth's magnetic poles.

moon gas particles attracted by the Earth's magnetic poles.

the sun's gas particles collide with the Earth's atmosphere gas particles.

there are no clouds in the sky.

In the answer box below, write the word which completes this sentence:

The Earth’s magnetic field extends into space and forms the ______________.

• Question 1

In the answer box below, write the two words which complete this sentence:

A magnetic field is the area around a magnet where the ________ _______ creates an effect.

magnetic force
EDDIE SAYS
The magnetic force is the force that attracts magnetic materials towards a magnet.
• Question 2

In the answer box below, write the word which completes this sentence:

A magnetic material would always be _______________ to a magnet.

attracted
EDDIE SAYS
This is the case with all magnetic materials at all times.
• Question 3

In the boxes in the table below, write the words that replace A and B in the gaps in the following sentence:

A magnet can be _______A_______ to or _______B_______ by another magnet.

 Missing Words A B
EDDIE SAYS
If two like poles of the magnets are near each other then they will be repelled, but the two opposite poles will be attracted.
• Question 4

Select the correct option from the list below to complete this sentence:

A magnetic field can be shown using....

iron filings
EDDIE SAYS
The iron filings are small enough (almost like a powder) so they spread nicely around a magnet to show the magnetic field.
• Question 5

What is the best way to demonstrate the magnetic field of a magnetic object?

drawing magnetic field lines
EDDIE SAYS
The magnetic field lines would show the area around the magnet where the magnetic force works, but they have to be drawn as they are not visible to the naked eye. The closer they are, the stronger the force.
• Question 6

Select TWO options from the list below to complete the following sentence:

The direction of the magnetic field lines.........

is always the same as the direction of the magnetic field.
is different at different parts of the magnetic field.
EDDIE SAYS
The magnetic field lines can point to all different directions around a magnet.
• Question 7

Is the following statement true or false?

The Earth’s core is high in non-magnetic materials.

false
EDDIE SAYS
This question can be tricky. The Earth's core is high in iron-rich materials, but the temperatures are so high, especially in the inner core, that magnetism is lost. However, the outer core materials are still magnetic.
• Question 8

In the answer box below, write the two words that complete this sentence:

The Earth’s core is high in ______-______ materials.

iron-rich
iron rich
EDDIE SAYS
There is a lot of molten and solid iron in Earth's core.
• Question 9

Select two options from the list below which complete the following sentence:

The Aurora Borealis is created because of.....

sun gas particles attracted by the Earth's magnetic poles.
the sun's gas particles collide with the Earth's atmosphere gas particles.
EDDIE SAYS
The Sun's charged gas particles are attracted by the Earth's magnetic poles and then collide with the Earth's atmosphere gas particles, creating the Northern Lights (Aurora Borealis).
• Question 10

In the answer box below, write the word which completes this sentence:

The Earth’s magnetic field extends into space and forms the ______________.

magnetosphere
EDDIE SAYS
The magnetosphere extends around the Earth into space.
---- OR ----

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