Question

If dielectric constant and dielectric strength be denoted by K and X respectively, then a material suitable for use as a dielectric in a capacitor must have:

• A. high K and high X
• B. high K and low X
• C. low K and high X
• D. low K and low X

Answer 1

The correct option is A high K and high X

Dielectric is an insulator with a dielectric constant $K$ used between the plates of the capacitor to increase the capacitance of the capacitor by a factor of $K$

The capacitance of a Capacitor with dielectric $C\propto K$, $K$ is the dielectric constant

Electric field strength $X$ is the measure of the maximum electric field strength. These are the fields above which the material breaks and began to conduct. Dielectric field imposes a limit on the maximum voltage that can be applied for given plate separation.

Hence material with $high$ $K$ and $high$ $X$ is suitable for use as a dielectric in a capacitor