Paper has a dielectric constant K = 3.7 and a dielectric strength of 15 × 106 V/m. Suppose that a typical sheet of paper has a thickness of 0.11 mm. You make a "homemade" capacitor by placing a sheet of 21 × 14 cm paper between two aluminum foil sheets (Fig. 17-48) of the same size.
(a) What is the capacitance C of your device?
(b) About how much charge could you store on your capacitor before it would break down?

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Aluminum Paper Aluminum