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32 Cards in this Set
- Front
- Back
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3 magnetic materials |
Iron, Nickel and Cobalt |
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The Earth's core is mostly... |
Molten iron and nickel whixh gices the Earth it's magnetic field and protects us from radiation from space. |
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On a permanent magnet, S = |
In |
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N = |
Out |
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When an electric current passes through a wire it makes a... |
Magnetic field. The affect is stronger if the wire is coiled. |
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What does it mean by "permanent magnet"? |
Their magnetism is there all the time and cannot be turned on or off as it can with electromagnets. |
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Bar magnets have two poles... |
North Pole (N) and South Pole (S) |
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What do opposite poles do? |
Attract |
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What do like poles do? |
Repel |
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What happens if a permanent magnet is repeatedly knocked? |
The strength of their magnetic field is reduced. |
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What is converting a magnet into a non-magnet called? |
Demagnetization. |
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What is steel? |
An allow of iron, and so can also be made into a magnet. |
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What are bar magnets? |
Permanent magnets. |
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What does it mean by "permenant magnets"? |
Their magnetism is there all the time and cannot be turned on or off as it can with electromagnets. |
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What are the two poles bar magnets have? |
South Pole - S and North Pole - N |
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What do pposite poles do? |
Attract |
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What do like poles do? |
Repel |
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What happens if a permanent magnet is repeatedly knocked? |
The strength of their magnetic field is reduced. |
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What is converting a magnet into a nonmagnet called? |
Demagnetisation |
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Why can steel also be made into a magnet? |
Because it is an alloy of iron. |
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Alloy |
An alloy is a mixture of two or more elements, at least one of which is a metal. |
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Electromagnet |
A magnet made by wrapping a coil of wire around an iron bar and passing an electric current through the coil. |
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Magnet |
An object that produces a magnetic field which pulls on other magnetic materials and attracts or repels other objects. |
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Magnetic field |
An area around a magnetic material or the moving electric charge through which the force of magnetism acts. |
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Pole |
Either of the two points of a magnet to and from which the lines of magnetic force are directed. |
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What are the units of power? |
Watts are the units of power. |
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Which term describes alloys which include iron? |
Ferrous alloys |
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What is the test for a magnet? |
Repulsion is the test for a magnet because unmagnetised iron will be attracted to another magnet but it will not be repelled. |
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Where is the strongest magnetic field around a bar magnet? |
The strongest fields are found around the poles of a bar magnet. |
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What is the name given to the attraction of unmagnetised iron to a magnet? |
The attraction of unmagnetised iron to a magnet is called induced magnetism. The attraction is induced by the magnet. |
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What is another term for substances that can only be temporarily magnetised? |
Substances that can only be temporarily magnetised are called soft. |
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Specifically in which direction do the lines run in a field diagram? |
The lines run from north to south in a field diagram. |
