Magnetic Poles & Magnetic Forces
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20 Terms
What is a magnet?
An object that produces a magnetic field.
What are the two poles of a magnet?
North pole and south pole.
Where is the magnetic force strongest around a bar magnet?
At the poles.
What happens when two like magnetic poles are brought together?
They repel each other.
What happens when two unlike magnetic poles are brought together?
They attract each other.
What type of force is magnetic force?
A non-contact force.
Why is magnetic force a non-contact force?
Magnets can exert forces on objects without physically touching them.
What happens when two magnets interact?
They exert equal and opposite forces on each other.
What materials are attracted to magnets?
Ferromagnetic materials, including iron, steel, nickel and cobalt.
Are all metals magnetic?
No, many metals, including copper and aluminium, are not strongly attracted to ordinary magnets.
What is a permanent magnet?
A magnet that produces its own persistent magnetic field.
What is an induced magnet?
A material that becomes magnetised when placed in a magnetic field.
What happens when a magnetic material is placed near a permanent magnet?
It can become an induced magnet.
What force acts between a permanent magnet and an induced magnet?
Attraction.
Why does an induced magnet attract a permanent magnet?
The magnetic field induces opposite polarity at the nearest end of the material.
What happens to an induced magnet when the external magnetic field is removed?
It loses most or all of its magnetism, depending on the material.
What is the main difference between permanent and induced magnets?
Permanent magnets retain magnetism, whereas induced magnets usually lose it when the external field is removed.
Why is soft iron useful for making induced magnets?
It is easily magnetised and demagnetised.
Why is steel useful for making permanent magnets?
It retains its magnetism well.
What happens when a freely suspended bar magnet settles?
It aligns approximately north–south with Earth's magnetic field.