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) You then fill the capacitor with a dielectric material of dielectric constant k while the capacitor remains connected to the same potential difference. What are the new charge on the plates and the new energy stored by the capacitor? (c) Where did the energy change come from? the capacitor with a dielectric material of dielectric constant k while the capacitor remains connected to the same potential difference. What are the new charge on the plates and the new energy stored by the capacitor? (c) Where did the energy change come from?
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