Magnetism Flashcards
1
Q
Permanent Magnets
A
Produce a magnetic field
2
Q
Induced Magnets
A
Become Magnetised when in another magnetic field
3
Q
Opposite Poles
A
Attract eachother
4
Q
Like Poles
A
Repel Eachother
5
Q
Split Ring Commutator
A
Needed to ensure that the current is reversed every half turn, in order to keep coil spinning
6
Q
How do you increase speed of motor
A
Add more turns to coil
Increase PD/ Current
Use a stronger magnet
7
Q
What is Motor effect
A
Both sides of coil experience a force in opposite directions and it turns
8
Q
Loud speakers
A
Use motor effect
Current sent from source
Causes coil + Speaker Cone to vibrate producing sound waves
9
Q
Examples of induced magnets
A
Iron
Nickel
Cobalt
10
Q
How is a solenoid formed
A
wire is looped into cylindrical coil
11
Q
A
