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## Homework Statement

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 dΦ

_{e}/dt = I/ ε

_{0}. 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.

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## Homework Equations

**So using the line integral ∫B⋅dl= μ**[/B]

_{0}(I + I_{d})## The Attempt at a Solution

you get B⋅2πr= μ

_{0}(I + I

_{d})

However i don't understand what I and I

_{d}are?

I have the equation I

_{d}= ε

_{0}dΦ

_{e}/dt

however i don't understand why this is true or where this takes me?

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