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WorksheetsIGCSE/GCSE Magnetism
Total questions: 15
Worksheet time: 8mins
A metal bar PQ hangs from a thin thread and always comes to rest with end P pointing north.
Another bar XY of the same metal settles in no definite direction.
What happens if the two bars are brought near one another?
End P and end Q both attract end X.
End P attracts end X but repels end Y.
End P neither attracts nor repels end X.
End P repels end X but attracts end Y.
The diagram shows a 12 V d.c. power supply connected across a coil with a metal core.
The core becomes a magnet when the current is switched on. It remains a magnet after the current is switched off.
From which metal is the core made?
aluminium
copper
soft iron
steel
What always produces a permanent bar magnet?
an iron bar in a coil carrying alternating current (a.c.)
an iron bar in a coil carrying direct current (d.c.)
a steel bar in a coil carrying alternating current (a.c.)
a steel bar in a coil carrying direct current (d.c.)
Which material is best for magnetic screening?
copper
iron
lead
plastic
Which material is used to magnetically screen electrical equipment from unwanted magnetic fields?
Aluminium
Copper
Iron
Steel
The magnetic field around two bar magnets is shown.
Which diagram represents the correct arrangement of magnetic poles?
Which list contains an example of a non-magnetic material, a magnetic material and a magnetised material?
copper, iron, a compass needle
copper, iron, polythene
iron, steel, a compass needle
iron, steel, polythene
Which properties make materials suitable for use as a core in an electromagnet?
difficult to magnetise and easy to demagnetise
difficult to magnetise and retains magnetic strength
easy to magnetise and retains magnetic strength
easy to magnetise and easy to demagnetise
A
B
C
D
Which row describes the ease with which iron or steel can be magnetised and demagnetised?
A
B
C
D
An iron nail can be magnetised using a coil.
How can the nail be demagnetised?
leaving the apparatus switched on for a long time
removing the nail from the coil while using an a.c. supply
using a coil with fewer turns
using more cells
Delicate instruments are often placed in a ‘box’ to protect them from stray magnetic fields.
What is the material used for the box and why is it chosen?
Aluminium is used because it is a non-magnetic material.
Copper is used because it has a low electrical resistance.
Polythene is used because it is a good electrical insulator.
Soft iron is used because it is a magnetic material.
The diagram shows how a steel bar can be magnetised.
Which statement describes how the steel bar can be demagnetised?
Reverse the d.c. supply and gradually decrease the current in the circuit.
Reverse the d.c. supply and gradually increase the current in the circuit.
Use an a.c. supply and gradually decrease the current in the circuit.
Use an a.c. supply and gradually increase the current in the circuit.
Which part of a video tape recording system does not rely on magnetic material for its operation?
the drive motor
the power lead
the transformer
the video tape
The diagram shows a brass rod and an iron rod beside each other at the bottom of a rectangular coil.
What happens when a d.c. current passes through the coil?
Only the brass rod is magnetised.
Only the iron rod is magnetised.
The two rods attract each other.
The two rods repel each other.
