Equation help desperately needed Faraday Equation.

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Hello,

What do i substitute the 'd' and 't' for in this equasion:
It just didnt say, so i am a bit lost!
 

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It's not d and t, it's simply dt which is the time differential. See http://hyperphysics.phy-astr.gsu.edu/Hbase/electric/farlaw.html" for more information.
 
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Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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