A cylindrical parallel plate capacitor of radius R is discharged by an external current I. The
total electric field flux inside the capacitor changes at a rate dΦe/dt = I/ ε0. What is the
strength of the resulting magnetic field B(r, I) inside the capacitor at a radial distance r
from the centre axis? Start the answer with Maxwell’s extension to Ampere’s law.
So using the line integral ∫B⋅dl= μ0 (I + Id )[/B]
The Attempt at a Solution
you get B⋅2πr= μ0 (I + Id )
However i don't understand what I and Id are?
I have the equation Id= ε0 dΦe/dt
however i don't understand why this is true or where this takes me?