Magnetism and motor effect Flashcards
Which part of the magnet are the magnetic forces strongest?
The poles
What happens when 2 magnets are brought close to eachother.
Exert a force on eachother
Type of force when two like poles brought close to eachother
Repulsive, non-contact
Type of force when two unlike poles brought close to eachother
Attractive, non-contact
What is a magnetic field
Region around magnet where another magnet experiences a non contact force
Difference between a permanent and induced magnet.
- Permanent magnet produces its own magnetic field.
- Induced magnet becomes magnetic when placed in a magnetic field.
Induced magnetism always causes what type of force.
Force of attraction
What is the effect when an induced magnet leaves a magnetic field.
Induced magnet loses most/all of its magnetism
Give 4 examples of magnetic materials
Steel
Iron
Nickel
Cobalt
What always can be said between a magnet and a magnetic material.
It is always attractive
How does strength of magnetic field alter as you move further away from magnet producing it.
Strength decreases
What direction does a magnetic field point.
- In the direction of the force a north pole would experience if placed in the field.
- From the north seeking pole to the south seeking pole of the magnet.
What does a magnetic compass contain?
A small bar magnet that points in the direction of the Earths magnetic field.
What is produced when a current flow through a conducting wire.
A magnetic field is produced around the wire.
What determines the strength of the magnetic field around a current carrying wire.
The magnitude of the current
High concentration of field lines mean the field is strong or weak.
Strong
How is plotting a compass used to map out a magnetic field.
- Place a compass on paper near field
- Draw an arrow direction compass points.
- Repeat on different points on paper.
- Join the arrows to make a complete field pattern.
What is a solenoid
A coil of wire which when current passes through, creates a strong magnetic field.
Describe the magnetic field inside the solenoid
Strong and uniform
Is the field on the outside of the solenoid strong or weak, why?
Fields from each coil cancel out, making the outside field weak.
