We already know what happens when you add a dielectric to an electrically isolated capacitor. This time the capacitor is connected to a constant power supply, so the electric potential difference is what stays fixed instead of the charge. The capacitance goes up, the charge on the plates goes up, and yet the electric field between the plates does not change at all. Bobby asks the obvious question, which is how that can possibly be true, and Billy follows it up by asking what happened to the induced electric field from the polarized dielectric. Working through both questions is really the heart of this lesson.
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