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(A) The capacitance of a parallel plate capacitor is given by $C = \frac{k \epsilon_0 A}{d}$,where $k$ is the dielectric constant. To maximize capacit

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High $k$ and high $x$

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(A) The capacitance of a parallel plate capacitor is given by $C = \frac{k \epsilon_0 A}{d}$,where $k$ is the dielectric constant. To maximize capacitance,we require a high value of $k$.Dielectric strength $x$ is the maximum electric field a material can withstand without breaking down. To prevent the capacitor from short-circuiting under high voltage,the material must have a high dielectric strength $x$.Therefore,a suitable dielectric material must have both high $k$ and high $x$.

If the dielectric constant and dielectric strength are denoted by $k$ and $x$ respectively,then a material suitable for use as a dielectric in a capacitor must have

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