Magnetism + Electromagnetism Flashcards
(7 cards)
1
Q
What are the four magnetic materials?
A
- iron
- steel
- cobalt
- nickel
2
Q
Attraction + repulsion between magnetic poles are an example of what type of force?
A
Non contact
3
Q
Where is the strongest area of a magnet?
A
Poles
4
Q
What does the strength of an electromagnetic field depend on?
A
- the current through the wire
- the distance from the wire
5
Q
Where should a current carrying wire be placed in a magnetic field to experience the full force of the motor effect?
A
Perpendicular to the magnetic field
6
Q
In Flemings left hand rule, what is the thumb representing, what is the 1st finger representing and what is the middle finger representing?
A
Thumb - direction of force
Pointing finger - direction of magnetic field
Middle finger - direction of current
7
Q
What are the three ways to increase the speed of rotation in an electric motor?
A
- Add more turns to the coil
- increase the magnetic field strength of the permanent magnets
- increase the current in the coil
