Question: The earliest capacitors, called "Leyden jars" were made by wrapping conducting metal foil inside and outside glass jars (which have a dielectric constant of 5.20). If the outer radius of the jars was 5.00 cm and the glass was 0.500 cm thick, how tall would the jar have to be to reach a capacitance of 21.0 nF? Assume foil is only wrapped around the sides of the jar, forming a cylindrical shape. The jar is rather tall; the height explains why capacitor design has progressed.
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