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18 Cards in this Set
- Front
- Back
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Magnetic field |
A region where a force is exerted on a magnetic material
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Field lines
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Show the direction of the electric field from north to south
Show the strength of the field - the closer together the field lines the stronger the field |
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Magnetic field lines around a wire
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in a concentric circle
follow the right hand grip rule |
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Flux Density
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the amount of magnetic, electric, or other flux passing through a unit area
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Lorentz force
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the force which is exerted by a magnetic field on a moving electric charge.
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Charged particles in a magnetic field
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travel in a circular motion
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The Hall effect
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the production of a potential difference across an electrical conductor when a magnetic field is applied in a direction perpendicular to that of the flow of current
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Electromagnetic induction
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the production of a potential difference across a conductor when it is exposed to an alternating magnetic field
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Faraday's law of electromagnetic induction
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The induced emf is proportional to the rate of change of flux linkage
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Flux
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a measure of the strength of a magnetic field over a given area
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Relationship between flux linkage and emf in a AC generator
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maximum flux linkage = minimum emf
and minimum flux linkage = maximum emf |
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Lenz's law
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when a current is induced by electromagnetic induction, the direction of the induced current is in the opposite direction to the change that causes the current
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Transformer
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an apparatus for reducing or increasing the voltage of an alternating current
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Ways to increase the efficiency of a transformer
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Thick wires with low resistance
Laminated core Core made from iron for flux confinement |
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Fleming's left hand rule
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Thumb = F
1st Finger = B 2nd Finger = I FBI |
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Right hand rule
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shows the direction of induced current when a conductor moves in a magnetic field
Thumb = F 1st Finger = B 2nd Finger = I |
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Solenoid
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a cylindrical coil of wire acting as a magnet when carrying electric current
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Hall probe
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device used to measure magnetic flux linkage
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