WorksheetsIGCSE Grade 9 Magnetism
Total questions: 60
Worksheet time: 2hrs 30mins
What is a permanent magnet?
Always have a magnetic field around them
Always does not have a magnetic field around them
Become magnetic only when in a magnetic field
What is an induced magnet?
Always have a magnetic field around them
Become magnetic only when in a magnetic field
North and South poles
Definition of “field” – “the region in which a (a) will act”
Why is the equator hot and the poles cold?
Poles are colder than the equatorial region because Sunrays do fall straight on poles
Poles are hotter than the equatorial region because Sunrays don't fall straight on poles
Poles are colder than the equatorial region because Sunrays don't fall straight on poles
How does a compass work?
A wooden piece is what makes a compass point north -- the small magnetic pin in a compass is suspended so that it can spin freely inside its casing and respond to our planet's magnetism.
A magnet is what makes a compass point north -- the small magnetic pin in a compass is suspended so that it can spin freely inside its casing and respond to our planet's magnetism.
A magnet works due to the electromagent placed within the device.
The strength of an electromagnet can be increased by doing:
(choose 2 answers)
Increasing the number of coils
Inserting an iron core
Inserting a plastic core
Placing it closer to the equator
Magnetic field around a bar magnet is strongest at the (a)
Same poles (a) . Different poles attract.
Direction of magnetism from each pole goes from (a) to South
The main magnetic metals are (a) , steel, nickel and cobalt
Which of these is not a magnetic material?
aluminium
steel
nickel
iron
Which of the above diagrams shows the magnetic field lines around the north pole of a magnet?
A
B
C
D
When magnets and metal bars are close together they experience forces.
Which row gives the correct description of the effect between these materials?
A
B
C
D
A magnetic compass points North. This shows that...
the Earth is tilted on its axis
the Earth is spinning
the Earth has a magnetic field
the Earth has gravity
A magnetic field line shows the direction of force acting on
a magnetic north pole
a magnetic south pole
a bar magnet
a current carrying wire
A uniform magnetic field can be produced between 2 permanent magnets. Which of the following arrangements of magnets will produce the field shown?
A
B
C
D
Some magnets are easily magnetised when placed in a magnetic field, and then quickly lose their magnetism once the field is removed. These materials are used in electromagnets, and are called...
soft magnetic materials
hard magnetic materials
temporary magnets
partial magnets
Which of these appliances does not use the effect of force on a current in a magnetic field?
loudspeaker
motor
lightbulb
electric fan
The force on a wire can be made stronger in several ways. Which one of these will not work?
Increase the current
Use stronger magnets
Use a coil with many turns
Make the wire thicker
If you push a metal bar quickly between 2 magnets it produces a voltage in the bar. What is this effect called?
Induction
Reduction
Generation
Production
The image shows an aluminium rod placed between 2 magnets.
How can a voltage be induced in this rod between the ends labelled A and B?
Replace the north pole with another south pole
Change the aluminium rod for a copper rod
Move the rod upwards or downwards
Heat the rod
A device that uses sound waves to move a coil can induce a small voltage signal in an external circuit that represents the sound. It is converting the energy in sound waves into electrical energy.
What is the name given to this device?
A loudspeaker
A dynamo
A generator
A microphone
The national grid uses step-up transformers to produce very high voltages in long cables that link towns and cities. Why is this?
People are less likely to steal the electrical energy because it is dangerously high voltage.
The transformers step up the power delivered by the same ratio as the step up in voltage.
Houses and offices need this very high voltage to operate
Less current is needed, and therefore there is less power loss in the cables.
-
A
B
C
D
-
A
B
C
D
-
A
B
C
D
-
A
B
C
D
-
A
B
C
D
-
A
B
C
D
-
A
B
C
D
-
A
B
C
D
A
B
C
D
An electromagnet is used to separate magnetic metals from non-magnetic metals.
Why is steel not suitable as the core of the electromagnet?
It forms a permanent magnet.
It has a high density.
It has a high thermal capacity.
It is a good conductor of electricity.
An old and expensive steel watch becomes magnetised. The owner wants to use the watch again. He must demagnetise the watch. What is the best method to do this?
Heat it until it glows red hot.
Pass direct current though it.
Place it in a plastic bag and put the bag in hot water for several hours.
Place it in a solenoid that carries alternating current and then slowly remove it.
A hard magnetic material can be used to make a permanent magnet.
A soft magnetic material can be used to make a temporary magnet.
Which row shows whether iron and steel are hard or soft magnetic materials?
A
B
C
D
A student wishes to make a permanent magnet. She has an iron rod and a steel rod.
Which rod should she use to make the permanent magnet, and is this rod a hard magnetic
material or a soft magnetic material?
A
B
C
D
In which pair are both materials magnetic?
aluminum and copper
copper and iron
iron and steel
steel and aluminum
Which statement about a magnet is correct?
A magnet attracts a gold rod.
A magnet does not attract a plastic rod.
A magnet never repels another magnet.
A magnet sometimes repels an unmagnetised nickel rod.
A
B
C
D
A
B
C
D
