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An air-filled capacitor is formed from two long conducting cylindrical shells that are coaxial and have radii of 16 mm and 78 mm. The electric

An air-filled capacitor is formed from two long conducting cylindrical shells that are coaxial and have radii of 16 mm and 78 mm. The electric potential to the outer conductor is -321 V (k = 1/4TTE = 8.99 x 109 Nm/C2). What is the  average energy density of the capacitor?

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