A 200-Volt battery is connected to a parallel-plate capacitor that has a dielectric slab (k= 2) filling the space between the plates. The plates are 10cm x 10cm and are 3mm apart. Now the battery is disconnected while the dielectric slab stays inserted, with care taken not to discharge the plates. After the battery is disconnected, the slab is removed completely from between the plates. What is the final potential difference between the plates? What is the final charge on the capacitor?