A parallel plate capacitor has an area of 1000 cm^2 and is 1.0 mm apart. The capacitor is connected to a power supply and charged to a potential difference of 1000 V. It is then disconnected from the supply, and a sheet of dielectric material with a dielectric constant of 5.0 is inserted between the plates, completely filling the space. Calculate the following:
(a) The voltage difference after the dielectric material is inserted.
(b) The magnitude of the charge on each plate after the dielectric material is inserted.