Magnetic 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?
Arepulsive, 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 a magnetic field?
The region surrounding a magnet where another magnet or magnetic material experiences a 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 is the effect when an induced
magnet is removed from a magnetic
field?
The induced magnet loses most/all of its
magnetism
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 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 does a magnetic compass contain?
A small bar magnet that points in the
direction of the Earth’s magnetic field
What is produced when current flows 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 flowing
through the wire.
Does a high concentration of field lines mean the
field is strong or weak?
Strong
True or false: magnetic field lines never cross each
other?
True, they never cross each other, overlap or touch
How is a plotting compass used to map out a magnetic field?
● Place a compass (containing a needle magnet) on a piece of paper near the field
● Draw an arrow in the direction the compass points
● Repeat at different points on the 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 found inside a solenoid.
Strong and uniform
Is the field on the outside of a solenoid strong or weak? And why?
Weak.
The fields from each coil cancel out,
making the outside field weak
