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A certain substance has a dielectric constant of 2.8 and a dielectric strength of 18.0 MV/m . If it is used as the dielectric material

A certain substance has a dielectric constant of 2.8 and a dielectric strength of 18.0 MV/m. If it is used as the dielectric material in a parallel-plate capacitor, what minimum area should the plates of the capacitor have to obtain a capacitance of 9.0010-8 F and to ensure that the capacitor will be able to withstand a potential difference of 4.9 kV?

THE ANSWER IS NOT 9.2

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