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7. A parallel plate capacitor is constructed of two sheets of aluminum, 20.0 cm by 80.0 cm, separated by a layer of air, dielect grid constant K = 1, which is 0.025 mm thick. (a) What is its capacitance? (b) If it is connected to a 40.0 volt battery, what will be the charge on the capacitor? (c) What is the energy stored on the capacitor? (d) What is the electric field inside the capacitor? (e) a dielectric material with a dielectric constant K = 4.50 replaces the air between the plates, what is the new capacitance?

Fig: 1