Combined Physics - P7 Magnetism and Electromagnetism
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Name the three magnetic materials.
• Iron • Cobalt • Nickel
What happens when two ‘like’ poles are brought together?
They repel each other
Is magnetism an example of a contact or non-contact force?
Non-contact force
What do you call a material that becomes magnetic when it is placed in the magnetic field of another magnet?
Induced magnet
Draw the magnetic field lines around a bar magnet.
What happens when two opposite poles are brought together?
They attract each other
Complete the diagram to show the directions that the plotting compasses will point.
Draw the magnetic field around an electromagnet.
What happens when a current flows through a wire?
A magnetic field is produced
Describe the magnetic field lines in the middle of an electromagnet.
Strong and uniform
Give three ways in which you can increase the strength of an electromagnet.
• Increase the voltage • Increase the number of coils on the wire • Use a soft iron core in the middle
What is a coil of wire called?
A Solenoid
Give two advantages of an electromagnet over a permanent magnet?
• You can turn an electromagnet on and off. • You can change the strength of the electromagnet
What causes the Earth to have a magnetic field?
Liquid iron in the Earth’s core