First, consider a capacitor of capacitance C that has a charge Q and potential difference V. Learning Goal: To be able to calculate the energy of a charged capacitor and to understand the concept of energy associated with an electric field. Part A The energy of a charged capacitor is given by U = QV/2, where Q is the charge of the capacitor and V/ is the potential difference across the capacitor. The energy of a charged capacitor can be described as the energy associated with the electric field Find the energy U of the capacitor in terms of C and Q by using the definition of capacitance and the formula for the energy in a capacitor. created inside the capacitor. Express your answer in terms of C and Q. In this problem, you will derive two more formulas for the energy of a charged capacitor; you will then use a parallel-plate capacitor as a vehicle for obtaining the formula for the U =S energy density associated with an electric field. It will be useful to recall the definition of capacitance, C = Q/V, and the formula for the capacitance of a parallel-plate capacitor, Submit Previous Answers C = 6 A/d, where A is the area of each of the plates and d is the plate separation. As usual, 6 is the permittivity of free space. Correct Part B Find the energy U of the capacitor in terms of C and V by using the definition of capacitance and the formula for the energy in a capacitor. Express your answer in terms of C and V. U = Submit Request