Magnetism and Electromagnetism Flashcards
Like poles…..
Repel
Magnets also…….other magnetic material
Attract
Magnetically hard materials have…………….magnetism (steel)
Permanent
What is a magnetic field
A region or area around a magnet where another magnetic material will experience a force
What do field lines show
Direction of field
Strength of filed
Shape of field
In which directions do field lines point
North to South
What will occur between two opposite poles
Uniform magnetic field - lines are parallel and evenly spaced
When a………..passes through a wire, a…………..field is created around the wire. This is called electromagnetism
Current
Magnetic
How can you determine the direction of of the field around a wire
Right hand grip rule 👍
How do you increase the strength of the magnetic field
Increase the current
Put more turns on the coil
Use a soft iron core
Use stronger magnets
The higher the current, the higher the………….
Strength
How does an electromagnet work
When a current flows through the coils, a magnetic field is induced in the core.
Increasing the current or amount of turns increases the strength
In Flemings left hand rule what do the finger represent
Thumb = motion/force
First finger = field (N,S)
Middle finger = current
How does Fleming’s left hand rule work
When an electron over in a magnetic field it experiences a force. This makes the wire it is in move unless it is moving parallel to the field
On a diagram how do you know wether the wire is coming into or out of the page
Into page = Circle with a cross in the middle (like lightbulb symbol)
Out of page = Circle with no cross
