Question: A large industrial capacitor with an air gap between the plates stores 1 4 0 kJ of energy at a potential difference of 1 2

A large industrial capacitor with an air gap between the plates stores 140 kJ of energy at a potential difference of 1200 V. A dielectric is inserted into the space between the plates of this capacitor and it can now store 300 kJ of energy at 900 V. What is the relative permittivity of the dielectric inserted between the plates of the capacitor?

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