Inserting a dielectric into an uncharged capacitor decreases the voltage because it reduces the net electric field between the conductors. The presence of the dielectric increases the capacitance while keeping the charge constant, leading to a lower voltage according to the formula V=Q/C. This phenomenon is also influenced by the dielectric's properties, specifically its polarization, which further contributes to the decrease in voltage. The discussion emphasizes the relationship between capacitance, charge, and voltage in the context of dielectrics. Understanding these principles is crucial for comprehending capacitor behavior in electrical circuits.
