Y10Magnets Flashcards
Any material that a magnet would attract is an example of a …?… material
magnetic
A ..?.. can be made only from a magnetic material
magnet
Iron and …?… are examples of magnetic materials
steel
The places on a magnet where the magnetic force is concentrated are called the ..?.. of the magnet
poles
Like poles …?…
repel
Unlike poles …?…
attract
The region around a magnet, where it exerts a magnetic force, is called a magnetic …?…
field
The …?… on magnetic field lines always point from North to South
arrows
If two …?… poles are placed next to each other, the field lines will flow directly from one to the other
unlike
If two …?… poles are placed next to each other, there will be a neutral point between them
like
A neutral point is a point where the total magnetic force is …?
zero
A coil of wire that you can pass electric current through is called a …?
solenoid
A solenoid with a current flowing through it behaves like a weak …?
magnet
The magnetic field pattern around a solenoid looks the same as the one around a …?
bar magnet
If you place an iron core down the middle of a solenoid, the strength of the electromagnet …?
increases
If you reduce the number of turns on the coil in an electromagnet, the strength of the electromagnet …?
decreases
You can increase the strength of an electromagnet by …?… the current flowing through it.
increasing
One advantage of an electromagnet, which makes it useful as a lifting magnet, is that it can be …????
switched on and off
Electromagnets can be made much …?… than permanent magnets
stronger
A relay is an electrically controlled …?
switch
A relay can use a small current to control a dangerously …?… current
large
When an electric bell is switched on, current flows through its …?
electromagnet
The electromagnet in a bell attracts the …??… armature
soft iron
As the hammer moves to hit the gong in an electric bell, it switches off the electromagnet by …?… contacts in the electromagnet circuit.
separating
