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A cylindrical capacitor is 0.047 m long and has a cylindrical core with a radius of 0.025 mm and a cylindrical metal sheath with a radius of 0.084 mm. The space between the core and the sheath is filled with a dielectric with a dielectric constant of [k]. If a battery provides a potential difference of 12 V to this capacitor, how much energy is stored in the capacitor in picojoules (pJ)?

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