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An isolated parallel plate capacitor has...

An isolated parallel plate capacitor has circular plates of radius `4.0cm`. If the gap is filled with a partially conducting material of dielectric constant `K` and conductivity `5.0xx10^-14Omega^-1m^-1`. When the capacitor is charged to a surface charge density of `15muC//cm^2`, the initial current between the plates is `1.0muA`?
a. Determine the value of dielectric constant `K`.
b. If the total joule heating produced is `7500J`, determine the separation of the capacitor plates.

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