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A parallel plate capacitor is initially filled with air. A potential difference V0 is produced between...

A parallel plate capacitor is initially filled with air. A potential difference V0 is produced between the plates and then the power supply is disconnected. After the power supply is disconnected a dielectric of dielectric constant k is inserted between the plates. What is the new voltage Vf between the plates? Group of answer choices

Vf = V0 / k

Vf = kV0

Vf = (1/2)(k + 1)V0

Vf = V0

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