Having exam tomorrow. Magnetic field between capacitors?

AI Thread Summary
The discussion focuses on calculating the magnetic field between circular capacitors, specifically for points outside the capacitor (r > R). The user has successfully applied Ampere's law for the region inside the capacitor (r < R) but struggles with the external region. They seek assistance in determining the magnetic field in this area and inquire about the rate of charge change on the capacitor. The conversation emphasizes the application of electromagnetic principles to solve the problem. Clarification and guidance on these calculations are requested.
ippo90
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You have a circular capacitor (radius = R). Find the magnetic field from the central axis,
for r > R?

I have solved the first one for r<R by using ampere's law:

/B dr = my(I + d/dt(flux of electric field))

the answer is hard to write in a post like this, but I will do if necessary.

I have been trying hard but can't figure it out. Can you help me?

Thank you for all help!
 
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How fast does the charge on the capacitor change?
 
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...
View full post »

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