Having exam tomorrow. Magnetic field between capacitors?

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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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