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A parallel plate capacitor has plates with equal and opposite charges ±Q , which are initially...

A parallel plate capacitor has plates with equal and opposite charges ±Q , which are initially separated by a distance d . The capacitor is not connected to a battery. Then, the plates are moved farther apart so they are now separated by a distance 2d and also a dielectric with dielectric constant κ=2 that fills the entire space in the gap is inserted. What happens to the stored energy U and the potential difference between the plates ΔV=V+−V− after the two changes (increasing separation and inserting dielectric) are made?

Does U (increase, decrease or stay the same) and does ΔV (increase, decrease or stay the same)?

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