Magnetism Flashcards
The picture shows a student after rubbing a balloon on his hair.
Why has the balloon become negatively charged?
Electrons have transferred from the student to the balloon.
Name the 4 magnetic materials.
Steel
Nickel
Iron
Cobalt
What type of materials allow electrical charge (electrons) to easily flow through them?
conductors
Where is the magnetic field strongest around a bar magnet?
At the poles (where the magnetic field lines are closest together)
What direction do the magnetic field lines point?
From north to south
When a student put a wire carrying a current between two magnetic poles the wire experienced a force.
How could the student increase the size of force?
Increase the strength of the magnets
Increase the size of the current through the wire
A student wanted to investigate how the number of turns on the coil affects the strength of an electromagnet.
What was the independent variable in this investigation?
The variable the student changed so the number of turns of wire.
A student wanted to investigate how the number of turns on the coil affects the strength of an electromagnet.
What was the dependent variable in this investigation?
The variable the student measured so the number of paperclips picked up.
A student wanted to investigate how the number of turns on the coil affects the strength of an electromagnet.
What were the control variables in this investigation?
The variables the student kept the same so the size of the current through the wire / size of the paper clips / material of the core
A student wanted to investigate how the number of turns on the coil affects the strength of an electromagnet.
Suggest why the students teacher warned them not to use a high voltage on the power supply.
The wire would get hot and could melt. The student might burn themselves.
Bar magnets are an example of which type of magnet?
Permanent magnets
