Topic 12: Magnetism And The Motor Effect 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 of the same sides of a magnet are bought near each other?
A repulsive, non-contact force
What type of force is exerted if two different sides of a magnet are bought near each other?
An attractive, non-contact force
What is a magnetic field?
The region surrounding a magnet where another magnet or magnetic material experiences a non-contact force
What are 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 strength decreases the further you move away
In what direction does a magnetic field point?
- in the direction of the force that a north pole would experience if placed in the field
- from the north seeking pole to the south seeking pole of a magnet
What is produced when current flows through a conducting wire?
A magnetic field is produced around the wire
What determines the strength of a magnetic field around the current carrying wire?
The magnitude of the current flowing through the wire
What is the motor effect?
A current carrying wire will experience a force when placed in a magnetic field.
What rule is used to determine the force produced by the motor effect?
Flemings left hand rule
When using Flemmings left-hand rule what does the forefinger and second finger represent?
- forefinger points in the direction of the magnetic field
- second finger points in the direction of current flow in the conductor
When using Flemings left-hand rule what does the thumb represent?
The thumb points in the direction of the force produced by the motor effect
