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Consider two parallel-plate capacitors, C1 and C2, that are connected in parallel. The capacitors are identical except that C2 has a dielectric inserted between its plates. A 210 V battery is connected across the combination until electrostatic equilibrium is established, and then the battery is disconnected.
(a) What is the charge on each capacitor?
(b) What is the total stored energy of the capacitors?
(c) The dielectric is removed from C2. What is the final stored energy of the capacitors?
(d) What is the final voltage across the two capacitors?
A second converging lens of focal lenght 12 cm is placed to the right of the first lens. If the final image of the combined lens system is virtual and 15 cm from the second lens, then compute the distance between the two lenses
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