A dielectric is a(n) _________ material.

A dielectric is best described as a nonconducting material. This is fundamental to its role in electrical and electronic applications, where dielectrics are used to isolate conductive components and store electrical energy.

Dielectric materials have a high resistivity, which means they do not allow the flow of electric current under the influence of an electric field. Instead, they can polarize in response to an electric field, which enhances the capacitance of capacitors, for example. This property makes them essential for use in capacitors, insulators, and various electronic components where the prevention of current flow is necessary to maintain functionality and safety.

The other options do not accurately describe dielectrics. Conducting materials, for instance, facilitate the flow of electricity and would not be classified as dielectrics. Insulating materials can overlap with dielectrics since both inhibit electrical conductivity, but the term "nonconducting" more precisely captures the overall nature of dielectrics. Superconducting materials, on the other hand, exhibit zero electrical resistance but are relevant only at very low temperatures and in specialized applications, making them quite different from standard dielectric materials.