A parallel plate capacitor of capacitance C0 has a plates of area A with separation "d" between them. when it is connected to a battery of voltage V0, it has charge of magnitude q0 on its plates. it is then disconnected from the battery and the plates are pulled apart to a seperation "2d" without discharging them. What are the magnitude of the charge on the plates and the potential difference between them after the plates are 2d apart?