Magnets have a north pole and a south pole. Like poles repel but opposite poles attract. Electromagnets, motors, bells and compasses use magnetic fields.
Which of the following are magnetic poles?
North and south
East and west
Red and blue
Which of the following is not a magnetic material?
What do two poles of the same type do when they are brought close together?
What do two unlike poles do when they are brought close together?
The arrow on magnetic field lines shows them flowing in which direction?
From south to north
From north to south
From left to right
Where are the field lines most concentrated around a bar magnet?
At both poles
In the middle
At the north pole only
How can we increase the strength of an electromagnet?
Add an iron core
Reduce the number of turns on the coil
Reduce the current in the coil
What is one difference between electromagnets and bar magnets?
Bar magnets can be turned off but electromagnets cannot
Bar magnets have a magnetic field but electromagnets do not
Electromagnets need electricity but bar magnets do not
What can we use to find the shape of a magnetic field?
A coil of wire
Which of these doesn't usually use an electromagnet?
A school bell