Which property describes the ability of a conductor's insulation to transmit an electric field?

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Permittivity is the property that describes how a dielectric material, like insulation, responds to an electric field. It links the electric field to the electric displacement inside the material (D = εE), where ε = ε0εr. This tells us how readily the field lines pass through the insulation and how the material stores electric energy between conductors. In practical terms, higher permittivity means the insulation supports the electric field differently, increasing the capacitance between conductors and affecting how the field distributes across the insulation. Dielectric strength describes how much field the material can endure before breakdown, capacitance depends on both permittivity and geometry, and inductance deals with magnetic effects—not the insulation’s dielectric response.