UNIT 4: Magnetism Flashcards
1
Q
An electromagnet depends on ______ to produce a magnetic field
A
flowing current
2
Q
______ permanent magnets retain their magnetism longer than _____ magnets
A
man-made, natural
3
Q
_______ is a name for a naturally occurring magnetic material that is also called magnetite
A
Lodestone
4
Q
The three substances that form natural magnets are _____, ______, and ______
A
iron, nickel, cobalt
5
Q
A basic law of magnetism states that ______
A
unlike poles attract and like poles repel
6
Q
Magnetic lines of force are referred to as ______
A
flux
7
Q
If a permanent magnet is cut into pieces, each piece is a _______
A
separate magnet
8
Q
Permanent magnets do not require any ____________ to maintain their field
A
power or force
