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9 Cards in this Set
- Front
- Back
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How to find flux density from voltage area number of coils and frequency |
Fluxden.= Peak.Vol./areaxno.turnsx2πxfreq B = EMF/A xN x w (w = 2π x f) |
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What does the letter B represent? |
Flux density Measured in Tesla's |
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What does Φ represent? |
Magnetic flux measured in Webers (Wb) |
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What would using a larger magnet to pass through a coil of wire do to the induced EMF? |
The EMF induced would increase as; -more flux lines cut per unit time -thus a greater rate of change of flux linkage -emf prop. rate of change of flux linkage -Emf= N∆θ/ t where θ increases rest constant |
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Voltage induced equations |
E = Blv E= N∆θ/∆t E = BAN w sin wt |
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Why does an ion travel in a semicircular path whilst in a magnetic field? |
The magnetic field is perpendicular to the velocity of the ion The force on the ion perpendicular to magnetic field and velocity (diff. planes) The force changes the direction of v but not it's magnitude Force always perpendicular to velocity, thus undergoes circular motion (has centripetal force) |
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Why might some ions of the same element travelling in circular motion within a magnetic field, have a larger diameter than others? |
Ions can have different masses thus would have a larger/smaller diameter d = 2mv/BQ Ions could have different charges aswell |
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If you rotate a coil in a magnetic field twice as fast as originally, what happens to the graph of the voltage waveform on the transformer |
Twice the speed results in double the Frequency, also twice as many Flux lines will be cut per second to the amplitude would be double |
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Tesla definition |
A Tesla is the strength of the magnetic field that produces a force of 1 newton on a wire of 1 meter with one amp flowing through it Perpendicular to field Always use correct equation to define based on context |
