A12.5μf capacitor is connected to a power supply that keeps a constant potential difference of 24.0 v across the plates. a piece of material having a dielectric constant of 3.75 is placed between the plates, completely filling the space between them. a.) how much energy is stored in the capacitor before the dielectric is inserted? b.) how much energy is stored in the capacitor after the dielectric is inserted? c.) by how much did the energy change during the insertion? did it increase or decrease? d.) explain why inserting the dielectric (or equivalently exchanging air with the material) causes a change in the stored energy of the capacitor.

First, launch the video below. you will be asked to use your knowledge of physics to predict the outcome of an experiment. then, close the video window and answer the question at right. you can watch the video again at any point. part a as in the video, we apply a charge +q to the half-shell that carries the electroscope. this time, we also apply a charge –q to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? view available hint(s) as in the video, we apply a charge + to the half-shell that carries the electroscope. this time, we also apply a charge – to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? it deflects more than it did at the end of the video. it deflects the same amount as at end of the video. it does not deflect at all. it deflects less than it did at the end of the video. submit