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A parallel-plate capacitor has a capacitance of 1.8 F with air between the plates. The capacitor is connected to a 9.1-volt battery and charged.

A parallel-plate capacitor has a capacitance of 1.8 F with air between the plates. The capacitor is connected to a 9.1-volt battery and charged. The battery is then removed. When a dielectric is placed between the plates, a potential difference of 4.4 V is measured across the plates. What is the dielectric constant of the material?

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