A2 AQA Physics Capacitance

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LeLivre
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An electrolytic capacitor contains a very thin layer of dielectric formed when the capacitor is first charged. the insulating property of the dielectric in a certain 100mF electrolytic capacitor breaks down if the electric field strength across it exceeds 700MV/m. The maximum pd that can be applied to the capacitor is 100V.

a) Calculate the thickness of the dielectric layer
I got this correct, 0.14 micrometres

However, I don't know how to answer part b
b) The effective surface area of each capacitor plate is 1.6m^2. Estimate the energy stored per unit volume in the capacitor at 100V
Last edited by LeLivre; 1 year ago
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lordaxil
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First, calculate the energy stored in the capacitor (use voltage and capacitance), then divide by the volume between plates (you know the area, and the thickness is from (a)).
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