Electromagnetism Flashcards
(27 cards)
What is a magnetic field
Area of magnetic force around a magnet
How do we describe magnetic fields
Field lines
Which why do magnetic field lines point
North to south
How do show the strength of the magnetic field
The closer the lines the stronger the strength
How is a uniform magnetic field created
Putting a north side of a magnet and a south side together
What are permanent magnets
Always magnetic
What are temporary magnets
Sometimes magnetic 
What are induced magnets
Only magnetic when they are near another magnet
How do u plot a magnetic field
Using plotting compasses
What is electromagnetism
The electricity flowing through a wire creates a magnetic field
How is the magnetic field in a straight wire
In circles
How to to work out direction of field
Right hand rule
What is the right hand rule
Put right hand thump up and the way your fingers curl round is the direction of current
What is a solenoid
When u coil up a wire with a current running through it
What is the magnetic field of a solenoid
Similar to bar magnet
Where is the magnetic field weaker and stronger in a solenoid
Weaker out side
Strong inside
How to increase strength of magnetic field of solenoid
Adding an iron core
More coils
Increased current
How does adding an iron core increase magnetic field strength
By amplifying it
What is the motor effect
When a wire carting an electrical current is placed bwteen another magnetic field (2 magnets)
The two magnetic fields interact making the wire experience a force
What is the magnetic flux density
The strength of the magnetic field
Factors the effect size of force
Magnetic flux density
Length of wire
Current
How to work out direction of force when dealing with the motor effect
Fleming left hand rule
How does Fleming left hand rule work
First finger = direction of magnetic field
Second finger = direction of current
Thumb = direction of force
