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Magnetism and Electromagnetism

In this worksheet, students learn about magnets and magnetic fields, the Motor Effect and the creation of magnetism with electricity.

'Magnetism and Electromagnetism' worksheet

Key stage:  KS 4

Curriculum topic:  Physics: Magnetism and Electromagnestism

Curriculum subtopic:  Magnetic Fields

Difficulty level:  

down

Worksheet Overview

QUESTION 1 of 10

Magnetism

All magnets have a North-seeking pole and a South-seeking pole, often called North and South poles. The picture below shows a magnet with the two poles and iron filings attracted to it. The iron filings have formed a magnetic field around the magnet.

The magnetic force is not visible, but we can see its effect in the magnetic field. This is an area where a magnetic force is present. The magnetic field is represented by magnetic field lines, like in the diagram below. The closer together the lines are, the stronger the magnetic field is. The direction of the magnetic field is from the North to the South pole.

For all magnets, opposite poles attract, and similar poles repel.

 

The main natural magnetic materials are iron, cobalt and nickel. A magnet attracts and repels another magnet, but a magnetic material can only attract a magnet. The Earth has its own magnetic field around it, which led to the invention of compasses.

 

Electromagnetism

Electric currents have magnetic fields around them. A straight wire carrying electricity has a circular magnetic field around it, whereas a coil of wire has a magnetic field in the same shape as a magnet.

It is easy to make a simple electromagnet in the following way:

 

 

The magnetic field around an electromagnet can be increased by increasing the current in the wire, making more loops with wire and placing an iron or steel core inside the wire, as shown in the diagram above.

Iron is magnetically soft, so it is easy to magnetise and loses it magnetism when the electric current is turned off. Steel is magnetically hard, which makes it hard to magnetise, but it stays magnetic after the current is switched off.

 

The Motor Effect occurs when a wire carrying a current is placed in a magnetic field and a force is produced. The direction of the force depends on the direction of the magnetic field and the current.

Complete this sentence.

The magnetic force is ___________.

visible

invisible

What will happen if you place iron filings around a magnet? Two options are correct.

They will repel the magnet.

They will be attracted to the magnet.

They will form the magnetic field around the magnet.

They will turn it into an electromagnet.

What is used to represent a magnetic field?

triangles

circles

lines

Complete this sentence.

The further apart the lines are, the _________ the magnetic field is.

stronger

weaker

What led to the invention of compasses?

The fact that there are naturally occurring magnetic materials.

The fact that there is a magnetic force.

All of the above combined with the fact that the Earth has its own magnetic field.

Tick the four materials necessary to make a simple electromagnet.

coiled wire

magnetic force

iron nail

battery

magnet

wires

Complete this sentence.

An electromagnet has 10 loops coiled around it. A pupil makes another 10 loops. The magnetic field is now __________.

stronger

weaker

Following the previous question, tick another way the magnetic field around an electromagnet can be increased.

Make more loops.

Increase the length of the wire.

Increase the electric current.

Which type of magnetic materials is easier to magnetise?

 easy to magnetise stays magnetic after current is switched off
hard (e.g. steel)
soft (e.g. iron)

What effect is produced when a magnetic force is created, because a current-carrying wire is placed inside a magnetic field?

the Matrix Effect

the Magnet Effect

the Motor Effect

  • Question 1

Complete this sentence.

The magnetic force is ___________.

CORRECT ANSWER
invisible
EDDIE SAYS
The magnetic force is invisible; we cannot see it, we can only see its effects.
  • Question 2

What will happen if you place iron filings around a magnet? Two options are correct.

CORRECT ANSWER
They will be attracted to the magnet.
They will form the magnetic field around the magnet.
EDDIE SAYS
The iron filings are magnetic so they will be attracted to the magnet and they will also take the shape of the magnetic field around the magnet.
  • Question 3

What is used to represent a magnetic field?

CORRECT ANSWER
lines
EDDIE SAYS
Magnetic fields are represented using lines.
  • Question 4

Complete this sentence.

The further apart the lines are, the _________ the magnetic field is.

CORRECT ANSWER
weaker
EDDIE SAYS
The further apart the lines are, the weaker the magnetic field is, because when the lines are closer together the magnetic field is stronger.
  • Question 5

What led to the invention of compasses?

CORRECT ANSWER
All of the above combined with the fact that the Earth has its own magnetic field.
EDDIE SAYS
The invention of compasses is due to the facts that there are naturally occurring magnetic materials along with the magnetic force produced by magnets, and that the Earth has its own magnetic field.
  • Question 6

Tick the four materials necessary to make a simple electromagnet.

CORRECT ANSWER
coiled wire
iron nail
battery
wires
EDDIE SAYS
A simple electromagnet can be made using coiled wire around an iron nail, connecting wires and a battery.
  • Question 7

Complete this sentence.

An electromagnet has 10 loops coiled around it. A pupil makes another 10 loops. The magnetic field is now __________.

CORRECT ANSWER
stronger
EDDIE SAYS
The magnetic field around an electromagnet becomes stronger when you make more loops around the wire.
  • Question 8

Following the previous question, tick another way the magnetic field around an electromagnet can be increased.

CORRECT ANSWER
Increase the electric current.
EDDIE SAYS
Apart from making more loops around the iron core, the strength of an electromagnet can be increased by increasing the electric current.
  • Question 9

Which type of magnetic materials is easier to magnetise?

CORRECT ANSWER
 easy to magnetise stays magnetic after current is switched off
hard (e.g. steel)
soft (e.g. iron)
EDDIE SAYS
Iron is magnetically soft, so it is easy to magnetise and loses it magnetism when the electric current is turned off.
Steel is magnetically hard, which makes it hard to magnetise, but it stays magnetic after the current is switched off.
  • Question 10

What effect is produced when a magnetic force is created, because a current-carrying wire is placed inside a magnetic field?

CORRECT ANSWER
the Motor Effect
EDDIE SAYS
The Motor Effect is produced when a magnetic force is created, because a current-carrying wire is placed inside a magnetic field.
---- OR ----

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