1. A parallel plate capacitor has a capacitance of 2.0 nF. The capacitor is initially charged such that the potential difference between the plates is 100 V with a dielectric between the plates of ruby mica (x - 5.4). The capacitor is then disconnected from the power source. a) How much work must be done to remove the ruby mica sheet? b) Determine the potential difference between the plates after the ruby mica sheet has been removed