Magnets, magnetic fields and electromagnetism Flashcards
What is a magnet?
Any material or object that produces a magnetic field.
What is the most common magnet?
A bar magnet.
How many poles does a magnet have and what are their names?
Two poles. The north pole and the south pole.
What do we use to represent a magnetic field?
Field lines.
What are field lines?
Arrows that you draw around a magnet to show the magnetic field and the direction of it
Where do the field lines go into in a magnet and where do they come out of
They go into the south pole . They will go out of the north pole
In magnets, what does it mean when magnetic field lines are closer together?
The magnet is stronger in that area
How can you figure out whether an end of a magnet is north or south.
The north of a compass will line up with the field lines of whatever magnetic field it is put in.
which pole will the compass point to?
The south pole
What happens if you push the two north or south poles of a magnet together?
They will repel.
What happens if you push the north and south pole of a magnet together and why?
They will attract because the field from the north will go into the south pole of the other magnet.
What is a magnetic material?
Any object that can be influenced by magnetic fields, and has the potential to become a magnet.
what are the three elements that are magnetic materials
nickel, cobalt and iron ( including their alloys, e.g. steel)
What is special about permanent magnets?
They will produce a magnetic field all the time.
What is special about induced/temporary magnets?
They will only have a magnetic field temporarily.
The force between a temporary or induced magnets will always be attractive or repulsive?
attractive
what is the definition of a magnetically soft material
where a magnetic material (mainly nickel and iron) loses their magnetism very quickly
what is the definition of a magnetically hard material
where a magnetic material (E.g. steel) that will lose their magnetism slowly
what is electromagnetism?
where electric currents produce their own magnetic field.
A current goes up a wire. Will there be a magnetic field?
Yes
Where will the magnetic field be strongest in a bar magnet?
At the poles
where will the magnetic field be strongest in a wire when a current goes up it?
Closest to the wire
when a current goes up a wire, where will the magnetic field be?
around the wire.
What rule do we use when we need to figure out what the direction of the magnetic field is when a current goes through a wire?
the right hand rule
