10 questionsð¬ð§English
𧲠Magnets & Electromagnets â Year 8
Physics · Year 8 (KS3) â poles, magnetic fields and how to build and strengthen an electromagnet
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Questions
Two bar magnets are pushed together so that their north poles face each other. What happens?
Nothing, poles of the same type cancel
They attract each other
They repel each other
They stick together, then repel
20s
Which of these metals is a magnetic material?
Brass
Aluminium
Copper
Iron
20s
Outside a bar magnet, in which direction do magnetic field lines point?
From both poles in towards the middle
From the north pole to the south pole
From the middle out towards both poles
From the south pole to the north pole
20s
Where is the magnetic field of a bar magnet strongest?
Halfway between the poles, outside
Equally strong all around it
In the middle of the magnet
At the poles
20s
You make an electromagnet by wrapping wire around a nail. Which change makes it stronger?
Wrapping more turns of wire around the nail
Using fewer turns spaced further apart
Reversing the direction of the current
Unwinding the coil into a straight wire
30s
Which core material is best for an electromagnet that must lose its magnetism quickly when switched off?
Wood
Soft iron
Steel
Copper
30s
A compass needle's north pole points to Earth's geographic North Pole. What kind of magnetic pole is found near there?
No magnetic pole at all
A north and a south pole together
A magnetic north pole
A magnetic south pole
30s
What happens to an electromagnet if you reverse the direction of the current in its coil?
It stops being magnetic
Its north and south poles swap ends
It becomes much weaker
It becomes twice as strong
30s
A metal bar is attracted to both the north and south poles of a magnet. What can you conclude about the bar?
It is not a magnetic material
It is a permanent magnet
It is a magnet with two north poles
It is a magnetic material but not a magnet
30s
Why do scrapyard cranes use electromagnets instead of permanent magnets to lift old cars?
They attract all metals, including aluminium
They need no electricity to work
They can be switched off to drop the load
They only attract the front of the car
30s