Capacitors
A capacitor of capacitance C with a vacuum between the plates is connected to a source of potential difference ΔV. (a) Write an expression for the charge on each of the plates and for the total energy stored by the capacitor. (b) The capacitor is then disconnected from the potential difference source and you fill it with a dielectric that has a dielectric constant k. What are the new charge on the plates and the new energy? (c) Where did the energy change come from or where did the energy go?
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