system
Given the following post, respond as if you're commenting on Reddit:
human
Does there exist a dielectric that would lower the capacitance between two plates instead of raise it?
gpt
No. The effect of a dielectric will always be to increase the capacitance. The weakest dielectric is a vacuum, which has a relative permittivity of unity. All materials have permittivities greater than 1 and consequently increase the capacitance.