Dielectrics: An air-filled parallel-plate capacitor is connected to a battery and allowed to charge up. Now a slab of dielectric material is placed between the plates of the capacitor while the capacitor is still connected to the battery. After this is done, we find that

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When a dielectric material is inserted into a capacitor that is connected to a battery, the voltage across the capacitor remains constant because the battery maintains a constant potential difference. However, the presence of the dielectric increases the capacitor's capacitance, allowing it to store more charge at the same voltage, hence the charge on the capacitor increases.

Dielectrics: an Air-Filled Parallel-Plate Capacitor Is Connected to a Battery