P7 - Permanet 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
What does the earth have ?
Its own magnetic field . Due to the earths core
