Question
Dielectric materials are insulators placed between the plates of a capacitor that increase capacitance by a factor equal to ____.
Answer
Dielectric materials are insulators placed between the plates of a capacitor that increase capacitance by a factor equal to the material’s dielectric constant, κ.
So the reason you can't have a conductor is that it would essentally complete the circute, so electrons would flow and the capaciter would just become a hunk of metal – but if you have an insulator, electrons are not allowed to leave their atoms so they just get polarized (actualy creating an electric field in the opposite direction)
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