What are the 4 magnetic materials
Iron
Nickel
Cobalt
Steel
What is steel comprised of?
99% iron and 1% carbon
What is a magnetic field?
The region in space in which a magnetic material experiences a force
How do the poles of a magnet interact?
Opposite poles attract
Like poles repel
What direction do field lines go?
From north to south
How can we find magnetic field lines?
Using a compass.
Give a characteristic of a compass
South seeking, meaning they always point to the south pole of a magnet.
Where do compasses point on earth?
The geographical north pole.
What is an induced magnet?
Objects made out of magnetic materials which can gain magnetic properties when they are in the field of a magnet.
What happens to induced magnets when they move out of the magnetic field?
They lose their magnetic properties
What is a permanent magnet?
Something that has a permanent magnetic field.
Why is the earth a magnet?
It has a magnetic field. The reason why is because magma found in the core is mainly comprised of iron.
What is a solenoid?
A coiled wire that produced a magnetic field when current flows through it.
How can you increase the strength of an electromagnets magnetic field?
Increase the number of coils per unit length
Increase the current
Have a core
What are cores made out of?
Magnetic materials, usually iron.
What can electromagnets be used for?
Scrap yards
Electric doorbells
Maglev trains
What does the right hand rule show?
The direction of current in an electromagnet and the direction of the field.
What does an X show about the current of an electromagnet?
It’s going into the page
What does an • show about the current of an electromagnet?
It’s going out of the page (towards us).
What is magnetic flux density?
The strength of a magnetic field
What is magnetic flux density measured in?
Tesla
How is the magnetic field of an electromagnet drawn?
In concentric rings, the space between the rings gets larger each time. - btw draw at least 3 for the exam.
How can you increase magnetic flux density?
Increase the current of the wire
Reduce the distance of the wire
What is flemings left hand rule used for?
Explaining the motor effect.
