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18 Cards in this Set
- Front
- Back
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what is a magnet?
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a magnet is an object which attracts anything containing iron,cobalt,nickel and some alloys of iron oxide
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what is magnetism?
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magnetism is the name given to the ability of a magnet to pull or push certain materials
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what are magnets produced by different methods called? give an example |
artificial magnets
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what is the end of a bar magnet pointing south called
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south seeking pole
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does north and south repel or attract?
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attract
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does north and north repel or attract?
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repel
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the theory of magnetism
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according to the theory of magnetism, the magnetism of materials depends on the domains inside them, in an unmagnetised material the domains are arranged randomly so the domains cancel out the magnetised materials. For this reason an un-magnetised material iron nail can not display magnetism
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state 3 properties of a magnetised material
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arranged regularly domains lined up domains combine to form large amount of magnetism |
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what is a magnetic field
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a region formed around a magnet |
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state the properties of a magnet |
extend into 3d closed curves flow from npole to spole never cross each other closer lines-stronger magnetism magnetism is stronger at poles inside magnet field lines are directed from n pole to s pole |
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state the importance of a magnetic field |
earth is protected from magnetic storms by the magnetic field formed around earth
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what are ferromagnetic materials |
those substances which when placed in a magnetic field are strongly magnetised in the direction of the magnetic field
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examples of ferromagnetic materials
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iron , nickel, cobalt, steel, some rare earth metals
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what are the properties of a ferromagnetic material |
-strongly attracted by magnet -when a rod of ferromagnetic substance is suspended in a magnetics field it quickly aligns itself along the direction of the magnetic field -the relative magnetic permeability is large positive value |
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what is a uniform magnetic field |
is a magnetic field in which the magnetic strength is constant
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properties of a uniform magnetic field
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-parallel to each other -evenly spaced |
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what is electromagnetism
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branch of physics which deals with relationship between electricity and magnetism it states that electricity can create magnetism
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what is a domain
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is a region composed of a group of atoms whose magnetic fields are aligned in the same direction
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