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Two capacitors are identical, except that one is empty and the other is filled with a...

Two capacitors are identical, except that one is empty and the other is filled with a dielectric (k = 3.7). The empty capacitor is connected to a 12 -V battery. What must be the potential difference across the plates of the capacitor filled with a dielectric so that it stores the same amount of electrical energy as the empty capacitor?

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