Electromagnets Flashcards
(5 cards)
1
Q
What is an electromagnet?
A
An electromagnet uses an electrical current to generate a magnetic field.
2
Q
How to increase the strength of the electromagnet
A
Using more turns on the coil of wire will produce a stronger magnetic field.
Coiling up a longer piece of wire adds up the magnetic field of each turn.
3
Q
The motor effect
A
If two of the same
pole
(either north with north or south with south) are brought near each other, they push each other away. Like poles repel.
4
Q
What do you think would happen if you swapped the poles of the magnet?
A
The motor would spin the opposite direction.
5
Q
Electromagnets in microphones
A
In the microphone however, incoming sound causes the diaphragm to
vibrate
. This moves the attached coil of
