Magnets Flashcards
1
Q
How can invisible magnetic fields be revealed
A
Iron filings / a plotting compass
2
Q
What is an electromagnet
A
A magnet that uses an electrical current to generate a magnetic fiels
3
Q
What are the three ways to strengthen an electromagnet
A
Increase current
Increase the number of turns of the coil
Add an iron core
4
Q
What is the coil of the wire with many turns called
A
A solenoid
5
Q
What is the motor effect
A
When the force on a current-carrying wire near a permanent magnet cause the wire to move
6
Q
What are the two ends of a magnet called
A
North / South Pole
7
Q
In an electrical motor, what will happen if the current direction is reversed
A
The direction of the rotation will reverse
8
Q
What do magnetic field lines look like
A
Circular
9
Q
Name four magnetic materials
A
Iron
Steel
Cobalt
Nickel
