7.1 Permanent and induced magnetism, magnetic forces and fields
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At which part of the magnet are the magnetic forces strongest?
The poles of the magnet
What happens when two magnets are brought close to each other?
They exert a force on each other
What type of force is exerted if two like poles of a magnet are brought near each other?
A repulsive, non-contact force
What type of force is exerted if two unlike poles of a magnet are brought near each other?
An attractive, non-contact force
What is the difference between a permanent magnet and an induced magnet?
A permanent magnet produces its own magnetic field whereas an induced magnet becomes magnetic when placed in a magnetic field
What type of force does induced magnetism always cause?
A force of attraction
What happens when an induced magnet is removed from a magnetic field?
The induced magnet loses most/all of its magnetism
What is a magnetic field?
The region surrounding a magnet where another magnet or magnetic material experiences a non-contact force
Give four examples of magnetic materials
● Iron ● Steel ● Cobalt ● Nickel
What can always be said about the force between a a magnet and a magnetic material?
It is always attractive
How does the strength of a magnetic field alter as you move further away from the magnet producing it?
The magnetic field strength decreases the further you move away
In what direction does a magnetic field point?
In the direction that a north pole would experience a force, if placed in the field. From the north seeking pole to the south seeking pole of a magnet.
What does a magnetic compass contain?
A small bar magnet that points in the direction of the Earth’s magnetic field