Physics- Magnetism

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  • Created by: emuppet
  • Created on: 17-05-14 18:02
Name four magnetic materials:
Iron, steel, colbalt and nickel
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Where do the field lines around a bar magnet point from and to?
North to south
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Name two ways you can investigate magnetic fields around a magnet.
Using a compass to plot points- it will always point from n-s wherever it's placed in the field. Or use iron filings which align along the lines.
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Which poles attract and which poles repel each other?
Opposite poles attract, like poles repel.
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On an electromagnet, what causes a magnetic field around the wire?
The current.
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What is another name, beginning with an s, for a long coil of wire?
A solenoid- its magnetic field is just the same as a bar magnet.
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Name three ways that the strength of an electromagnet can be increased:
Having a bigger current, more turns on the solenoid or a soft iron core.
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What is a compass made out of?
A magnet.
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What's the independent variable?
What will be changed.
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What's the dependent variable?
The impact from the independent variable.
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What's the control variable?
What stays the same.
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What would iron filings be like if they were unmagnetised?
All mixed up.
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What would they be like if they were saturated?
All lined up.
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What's a domain?
They are tiny molecular magnets of a magnet. They each have a north and south. In an unmagnetised material, they are disorganised.
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What's a soft magnet?
A magnet that's easier to magnetise and demagnetise because its domains can easily be rearranged.
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Where is the magnetism the strongest on a magnet?
At the poles.
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Where do the magnetic field lines always go from?
n-s
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How do we know that Earth has its own magnetic field?
It has an iron core in the centre, and if you use a compass it shows you where north and south is.
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Where's geographical south?
At the top.
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When might a compass not be very reliable?
Next to a magnet or at one of the poles.
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What happens to a magnet hung up on a thin thread when it's at north pole?
Point towards the ground.
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Explain briefly about the electric bell:
The switch is pushed so the circuit is complete which turns the electromagnet on, the magnet attracts the iron and the hammer hits the bell, the contact with the contact screw is then broken, so the circuit is broken.The switch is switched on again.
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Other cards in this set

Card 2

Front

Where do the field lines around a bar magnet point from and to?

Back

North to south

Card 3

Front

Name two ways you can investigate magnetic fields around a magnet.

Back

Preview of the front of card 3

Card 4

Front

Which poles attract and which poles repel each other?

Back

Preview of the front of card 4

Card 5

Front

On an electromagnet, what causes a magnetic field around the wire?

Back

Preview of the front of card 5
View more cards

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