WorksheetsMagnets
Total questions: 20
Worksheet time: 10mins
A (a) is a naturally magnetised piece of the mineral magnetite.
A magnet can _____ and _____ other magnets. _____ materials are those that are attracted to magnets.
(a)
Name three magnetic materials.
Complete the sentences below.
Magnets have two opposite ends, which are called...
If you break a magnet in two you get...
State the law of magnetism.
When a _____ _____ is close to a magnet, it becomes a magnet itself. We say it has become an _____ _____. It will eventually lose its _____.
(a)
Describe what a soft magnetic material is. Give one example of such material.
Describe what a hard magnetic material is. Give one example of such material.
Magnetic materials have little groups of _____ that act as a tiny magnet. These are called _____ _____.
(a)
Complete the sentences below.
In a piece of iron, the magnetic domains are...
In a permanent magnet, the magnetic domains are...
By stroking a _____ _____ with a bar magnet and never reversing the _____ of stroke, you _____ all of the magnetic domains. Once all of the magnetic domains are facing the _____ direction, the substance has become an _____ _____, and will behave like a magnet for some time.
(a)
In which ways can you demagnetise an induced magnet?
banging or hammering
heating
freezing
stroking with a magnet in random directions
A magnet creates a _____ _____ around it. A _____ is exerted on a _____ _____ when it is brought into a magnetic field. This force is a _____ _____ _____, because the magnet and the material do not need to touch each other.
(a)
In which ways can you investigate the magnetic field around a magnet?
Use iron filings
Use other magnets
Use plotting compasses
Use aluminium filings
The magnetic field around a bar magnet is represented by _____ _____. Arrowheads on the lines show the _____ of the field. The lines come out of the _____ _____ and go into the _____ _____. The lines are more concentrated at the _____.
(a)
Where is the magnetic field the strongest?
At the centre of the magnet
At the poles
Near the South pole
The strength is the same everywhere
You can think of the Earth as having a gigantic _____ _____ buried inside. A compass points towards the _____ geographical pole of the Earth. We must therefore assume that the buried magnet has its _____ _____ pointing up.
(a)
Why does a compass have a lightweight magnet and a frictionless bearing?
To make the compass more affordable
So the compass does not catch fire
To allow the needle to turn easier
According to a theory, what causes the Earth's magnetic forces?
The interaction of gravity with the Sun and the Moon
The movement of the molten iron inside the Earth's outer core
The interaction of complicated wind patterns and ocean currents
What is one way to change a needle into a magnet?
Rub it against another needle
Stroke it with a magnet
Heat it and quickly freeze it
