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DC Circuits - Capacitors

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A non-ideal capacitor having a 'leaky' dielectric can be modeled by the circuit shown (see attachment), where RL represents the leakage resistance measured across the dielectric. A 100 pF parallel-plate capacitor has a mica dielectric of relative permittivity εr = 12 and resistivity of ρ = 1014 Ω m.

Calculate the leakage resistance of this capacitor.

The capacitor above initially holds a charge of 10 nC.
Estimate the time for the capacitor to completely discharge when left
on open circuit and the total energy dissipated in the dielectric during

I need to check my working and answers for this one.

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