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A parallel - plate vacuum capacitor is connected to a batteryand charged until the stored electric energy is U

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A parallel - plate vacuum capacitor is connected to a batteryand charged until the stored electric energy is U. The battery is removed, and then a dielectric materialwith dielectric constant K is inserted into the capacitor, filling the space between theplates. Finally, the capacitor is fully discharged through aresistor (which is connected across the capacitor terminals). A.)Find U_r, the the energy dissipated in the resistor. Express your answer in terms of U and other given quantities. B.) Consider the same situation as in theprevious part, except that the charging battery remains connectedwhile the dielectric is inserted.The battery is thendisconnected and the capacitor is discharged. For this situation,what is U_r, the energy dissipated in the resistor? Express your answer in terms of U and other given quantities.