Discussion
To obtain a high value of capacitance, the permittivity of the dielectric medium should be :
Answer: B
The permittivity should be high.
For a parallel-plate capacitor,
\[ C = \frac{\varepsilon_{0}\varepsilon_{r}A}{d} \]
so the capacitance is directly proportional to the permittivity of the dielectric. For a given plate area and spacing, a dielectric with a high relative permittivity, such as a ceramic, gives a much larger capacitance than air.
A low or medium permittivity, or the permittivity of air (\(\varepsilon_{r} \approx 1\)), gives a smaller capacitance, so none of those options achieves a high value.
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