A 2.0-cm-diameter circular parallel plate capacitor with a spacing of 0.5 mm is charged to 200 V. Assume the medium between the two parallel plats is a vacuum. a) What is the total energy stored in the electric field? b) What is the energy density? c) The voltage source is removed and the spacing is increased to 1.0 mm. Does the energy stored in the electric field change? If so, what is its new value? d) With the voltage source dis-connected, the spacing is reduced back to 0.5 mm. The capacitor is then filled with a material with a dielectric constant of 5.0. What is the potential difference after the dielectric is added?

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Combination of Capacitors

The connection of capacitors can be established in a circuit in two ways.