P15 - Electromagnetism Flashcards
How many poles do ALL magnets have?
2 poles
What do all magnets produce?
A magnetic field
What is a magnet?
A material or object that produces a magnetic field
What are the poles of a magnet called?
The North pole and The South pole
Lines of magnetic force come out of the ____________ Pole and go into the ____________
Pole
North pole
South pole
What do closer/denser magnetic field lines suggest about the area of the magnetic field?
The magnetic field is stronger in that area
What is the strange thing about magnets?
Not all magnetic materials are actually magnets
What is an ACTUAL magnet?
Any object that produces a magnetic field
What is a Magnetic material?
Any object that can be influenced by a magnetic field and has the POTENTIAL to become a magnet
What are the 3 common magnetic elements?
Nickel
Cobalt
Iron
What are permanent magnets?
Magnets that produce their own magnetic field all the time
What are induced/ temporary magnets?
Magnets that only have a magnetic field temporarily
How are induced magnets made?
When a piece of magnetic material that wasn’t an actual magnet, is put into a field of a permanent magnet
This induces the piece of magnetic material to develop its own magnetic field
What happens when you remove an induced magnet from a permanent magnet?
The magnetic material that was once the induced magnet will lose its magnetism
What are “magnetically soft” materials?
Where magnetic materials lose their magnetism very quickly
What are “magnetically hard” materials?
Where magnetic materials lose their magnetism very slowly
What are examples of a “magnetically soft” material?
Nickel and iron
What are examples of a “magnetically hard” material?
Steel
How do you represent current that has a magnetic field?
Using field lines
What would the field lines of a magnetic current in a wire look like?
Circles around the wire
If the direction of the current is UP, what is the direction of the circular magnetic field lines?
Anti-clockwise
If the direction of the current is DOWN, what is the direction of the circular magnetic field lines?
Clockwise
What is the motor effect?
A current carrying wire in the presence of a magnetic field will experience a force
Do Flemings Left hand rule with you hands.
Point your thumb UP
Point your index finger forwards
and Point your middle finger to the side
Explain what each index means in the Flemings left hand rule.
You index finger represents the direction of the magnetic field
Your middle finger represents the direction of the current
Your thumb now represents the force felt by the wire
What is electromagnetism?
When electric currents produce their own magnetic field
1
How do you calculate the strength of a force?
