Physics P3 3.1 Electromagnets.

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What are the ends of a magnet called?
Magnetic poles, there is a north pole at one end and a south pole at the other.
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What is the region around the magnet, in which a piece of iron or steel will be attracted to it, called?
Its magnetic field.
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What happens to iron filing that are placed near a magnet?
They will form a pattern of lines that loop from one pole to the other, these are lines of force of magnetic field lines.
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Where will a plotting compass placed in the magnetic field always point?
Along a field line.
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What happens if two magnets are brought close to each other with like poles together (north and north or south and south)?
They will repel each other.
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What happens if unlike poles of two magnets are brought close together (north and south or south and north)?
They will attract each other.
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What happens when a current flows through a wire?
A magnetic field is produced around the wire.
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How is an electromagnet made?
By wrapping insulated wire around a piece of iron called the core, when a current flows through the wire the iron becomes strongly magnetised.
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Why is an electromagnet very useful?
Because the magnetism is temporary and can be controlled, when the current is switched of the iron loses its magnetism.
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What are electromagnets used in?
Devices such as scrapyard cranes, circuit breakers, electric bells and relays.
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How does the force between two magnets work?
Like poles repel and unlike poles attract.
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What is a magnetic field line?
The line along which a plotting compass points.
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What does an electromagnet consist of?
A coil of insulated wire wrapped round an iron core.
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What is a magnetic field?
The region around a magnet, in which a piece of iron or steel will be attracted to it.
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What does an electromagnet consist of?
An electromagnet consists of a piece of insulated wire wrapped around an iron core.
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**LOOK UP THE MAGNETIC FIELD NEAR A BAR MAGNET**
**LOOK UP A DIAGRAM OF A SIMPLE ELECTROMAGNET**
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**IN THE EXAM YOU MAY BE GIVEN A DIAGRAM OF AN APPLIANCE THAT CONTAINS AN ELECTROMAGNET AND ASKED TO EXPLAIN HOW IT WORKS**
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Other cards in this set

Card 2

Front

What is the region around the magnet, in which a piece of iron or steel will be attracted to it, called?

Back

Its magnetic field.

Card 3

Front

What happens to iron filing that are placed near a magnet?

Back

Preview of the front of card 3

Card 4

Front

Where will a plotting compass placed in the magnetic field always point?

Back

Preview of the front of card 4

Card 5

Front

What happens if two magnets are brought close to each other with like poles together (north and north or south and south)?

Back

Preview of the front of card 5
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