Magnetism Flashcards
(17 cards)
Which magnetic poles repel and which attract each other?
Like poles repel, eg south and South, opposites attract, eg, north and south
Which metals are magnetic?
Iron, nickel and cobalt, an alloy can also be magnetic
Which pole of a magnet are magnetic materials attracted to?
Both
Why are some materials magnetic and some not?
Magnetic materials contain atoms that behave like tiny magnets, in non material materials the atoms do not. Magnetic materials contain magnetic fields.
How can a material be magnetised?
The domains are lined up by stroking the material with a magnetic repeatedly in the same direction with the North Pole.
Or
Heating it and then tapping in the same direction.
How can a magnet be demagnetised?
By dropping it repeatedly or by heating to a high temperature, the atoms then become jumbled up in different directions
Which magnetic materials are easy to magnetise and demagnetise? Which are difficult?
“Soft” materials such as iron are easy to magnetise and demagnetise. “Hard” materials such as steel are hard to magnetise and demagnetise.
The region around a magnet where a force is experienced is called a…?
Magnetic field
How can you show the pattern made by a magnetic field?
With iron filings or a plotting compass
What are the pattern of magnetic field lines?
Never touch, away from North Pole and towards south, closer together when force is strong
Where does the earth’s magnetic field originate from?
From the movement of iron in the earths core, the pattern of the earths magnetic field behaves as if there is a huge bar magnet in the earth.
Where does the North Pole point to?
To the north-seeking pole
What is an alloy
A compound of two different metals
Is itpossible to demagnetise a soft material with a hard one
Yes
Is it possible to demagnetise a hard material with a soft one
No
Do the earths magnetic poles always stay the same?
No they gradually, over time, reverse.
Does the earth have magnetic fields?
Yes, similar to that of a bar magnet. North to South.
