Magnets and electromagnets Flashcards
1
Q
What materials are magnetic?
A
Cobalt, nickel, iron
2
Q
What will happen if I coil an electric wire around a bar of soft iron?
A
It would create a magnetic field.
3
Q
What are the rules when drawing field lines?
A
Field lines never cross.
Field lines always point from north to south.
Field lines must leave and then come back.
4
Q
Define a magnetic field.
A
A magnetic field is a region around a magnet where magnetic materials experience a force.
5
Q
What will happen if a north magnet goes by a south magnet?
A
They will repel from each other.
6
Q
What is a solenoid?
A
A long coil of wire.
7
Q
What does the core have to be made of in order for an electromagnet to work?
A
Soft iron.
