7.1 Magnetism and Electromagnetism (permanent and induced magnetism, magnetic forces and fields) Flashcards
At which part of a 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
- 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 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 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
