How do you calculate magnetic flux for maxwells equation?

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radaballer
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Flux is defined as (Area Perpendicular to field) x (magnetic field). If a magnet is traveling through a coil of wires. How do you figure out the area perp to the field?
 
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Simon Bridge said:
You use geometry.
Is the area of a coil defined as one coil or the all of the coils?
 
If the current is separated then defined as the number of currents.