Term
| Stones found in Greece which had properties that attracted pieces of iron. |
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Definition
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Term
| is the attraction of unlike magnetic poles for each other and the repulsion between like magnetic poles. |
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Definition
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Term
| what is the source of magnetic force. |
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Definition
| motion of charged particles, usually electrons. |
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Term
| if a magnet has alternating north and south poles it has a long magnetic distance |
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Definition
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Term
like poles =
opposite poles= |
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Definition
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Term
| electric charges can be isolated while magnetic poles can not. |
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Definition
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Term
| negatively charged electrons and positive electrons are________________ |
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Definition
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Term
region of magnetic influence around a magnetic pole or a moving charged particle.
-ex)when you sprinkle iron dust around a magnet you get this effect. |
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Definition
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Term
| a magnetic field is produced by the motion of ____________. |
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Definition
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Term
| where is the motion in a common magnet bar |
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Definition
| in the electrons of the atoms in the magnet. |
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Term
| what is a chief contributor to magnetism. |
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Definition
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Term
a pair of electrons spining in the same direction =
a pair of electrons spining in the opposite direction= |
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Definition
-stronger magnet
-magnet works against each other. |
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Term
-the magnetic field of an individual iron atom is so strong that interactions among adjacent atoms cause
-what is the name for this. |
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Definition
-large clusters of them to line up with one another.
-magnetic domains |
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Term
| can magnetic domains of atoms alighn themselves. |
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Definition
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Term
| when someone put a magnet to a iron nail and removes the magnet the alignment will remain. |
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Definition
false.
-but if the permentant magnet is very strong then the nail may retain some magnetisim. |
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Term
| how are permanent magnets made |
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Definition
-placing iron in strong magnetic fields.
-stroking an iron with a magnet |
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Term
| heating or droping a magnet will make it stronger. |
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Definition
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Term
since a moving charge produces a magnetic field, it ______________.
when compasses surround a magnetic pole this happens. |
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Definition
| follows the charges of the magnetic field. |
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Term
| magnetic fields will__________ if more coils are present. |
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Definition
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Term
| a current carrying coil of wire is an_____________. |
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Definition
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Term
| how do ind. magnets gain more power |
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Definition
| by having iron in their coils. |
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Term
-the most powerful electromagnets are called______________ which large amounts of electrical current flows with ease.
-is there heat loss as energy moves through these_____ |
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Definition
-superconducting electromagnets.
-no |
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Term
| a charged particle at rest will not interact with a __________. but if the charged particle is ____ the magnetic charge is evident. |
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Definition
-static magnetic field
-moving |
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Term
| the direction of force is always perpendicular to the ___________ and to the velocity of the charged particle. |
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Definition
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Term
| the force that acts on a moving charged particle does not act along the line that joins the sources of interaction but, instead, acts perpendicularly to both_________________. |
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Definition
| magnetic field and electron beam. |
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Term
| a current of charged particles moving through a magnetic field also experiences a _______________. |
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Definition
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Term
| a sensitive current indicating instrument is called a _______________. |
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Definition
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Term
-in a motor the current is made to change direction every time the coil makes a ________________.
-the current in the loop flips direction with each half turn and __________________ |
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Definition
-half rotation.
-continuous rotation results. |
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Term
| the current in a motor is reversed during each half revolution by means of _____________________. |
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Definition
| -stationary contacts on the shaft. |
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Term
| what do scientist believe cause earths magnetic field. |
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Definition
| moving charges looping around within earths molten interior. |
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Term
-protons, alpha particles, and other atomic nuclei striped of electrons, and high energy electrons make up what kind of rays which hit earth.
-what happens when these hit electronics
-do these cause the northern and southern lights |
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Definition
-cosmic rays
-causes them to fail
-true |
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Term
| the idea of living creatures such as pigeons and bees having a capability called geomagnetism is impossible. |
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Definition
| false, animals do have this to find their way around. |
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