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16 Cards in this Set
- Front
- Back
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what is magnetism?
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the force of attraction or repulsion of a magnetic material due to the arrangement of electrons in the atoms
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on a magnet, where is the force noticed to be the strongest?
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The ends (The North pole & the South pole)
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what is the magnetic field?
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the region around the magnet in which the magnetic force can act
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the magnetic field lines go around the magnet in complete loops from:
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the North Pole to the South Pole
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what is the rule for magnetic poles?
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-LIKE poles REPEL each other
-UNLIKE poles ATTRACT each other |
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does the earth have a magnetic field?
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YES! It has a North & South pole.
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what types of materials can become magnetized?
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iron, steel, nickel, cobalt
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what makes one material more magnetic than another?
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-when the electron of the atoms all rotate in the same direction or the magnetic domains all align
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what are magnetic domains?
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-they are like mini-magnets that make up the material
-unmagnetized materials have randomly arranged domains - magnetized materials have most of the domains alligned |
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How can a temporary magnet be made
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-placing a strOng permanent magnet by a magnetic material
-stroking a magnetic material with a permanent magnet in one directiom |
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How can a permanent magnet become unmagnetized
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Make the domains random by
-dropping or hitting it -heat it |
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What is a permanent magnet made from
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Materials that are difficult to magnetize but tend to stay magnetized
- many are called Alnico - made from a mixture of aluminum,nickel,cobalt,copper,iron |
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What is the relationship between an electric current and a magnetic feild
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A current flowwing through a wire gives rise to a magnetic field whose direction depends on the direction of the current
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How do you make the magnetic field near a current carrying wire stronger
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Bend the wire into a series of coils to increase the number of turns
- increase the current - insert an iron core |
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What is an electromagnet
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A temporary magnet produced by an electric current
- found in phones, clocks, tv,car motors doorbells |
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Can electricity be made form magnetism
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YES!!!!!!!!!!!! A charging magnet field can create an electric current
- this is known as electromagnetic induction |
