Magnetism

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  • Created by: ac.x123
  • Created on: 10-01-20 16:50
What (scientifically) are the poles of the magnets?
The places where the magnetic forces are strongest
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What happens when you bring two magnets together?
They exert a force on each other (attraction or repulsion)
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What is a permanent magent?
A magnet that produces its own magnetic field
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What is an induced magnet?
A material that becomes a magnet when it is placed in a magnetic field
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Name the three magnetic elements
Iron, Cobalt, Nickel
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Name two ways to find the magnetic field pattern of a bar magnet
1. Drop iron filings over the magnet. 2. Using a compass, start at the north pole and plot points along the track of the magnetic field.
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Describe a magnetic field line
A line curving from the north pole to the south pole
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What does a magnetic compass contain?
A small bar magnet
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Which way does a compass needle point?
In the direction of the earths magnetic field (North)
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What is estimated to be the cause of the earth's magnetism?
Molten iron in the earth's core
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What is produced when a current flows through a conducting wire?
A magnetic field
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What is a solenoid?
A coil of wire in which a magnetic field is created by passing a current through it
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Describe the magnetic field in a solenoid
Strong and uniformed lines
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State three ways of increasing the strength of the magnetic field produced by a solenoid
1. Increase the current. 2. Increase the amount of coils on the wire. 3. Insert an iron core
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What is an electromagnet?
An induced magnet that is controlled and magnetised by an electric current
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Describe how a relay works
A relay is an electromagnetic switch. When the current is passed through, the electromagnet is activated and a movable iron arm is moved, completing the circuit. When the circuit is turned off, the iron arm returns to its natural position an
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Describe the motor effect
Conductor carrying a current is placed in a magnetic field; the magnet and the conductor exert a force on each other. This force=the motor effect
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What three factors does Fleming’s left hand-rule represent?
1. Force. 2. Current. 3. Magnetic field
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Give three ways of increasing the speed of an electric motor
1. Increase the current. 2. Increase the number of coils on the wire. 3. Use a stronger magnet
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What is an induced current?
A current made by moving a conductor relative to the magnetic field
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What is a simple generator made of?
Coil of wire, magnetic field, movement
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Other cards in this set

Card 2

Front

What happens when you bring two magnets together?

Back

They exert a force on each other (attraction or repulsion)

Card 3

Front

What is a permanent magent?

Back

Preview of the front of card 3

Card 4

Front

What is an induced magnet?

Back

Preview of the front of card 4

Card 5

Front

Name the three magnetic elements

Back

Preview of the front of card 5
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