An airtilled parallelplate capacitor is connected to a batter).r 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 the voltage across the capacitor had increased. the charge on the capacitor had not changed. the energy' stored in the capacitor had decreased. the charge on the capacitor had increased. the charge on the capacitor had decreased