Imagine that two parallel plates are charged to achieve a voltage difference Vo between the plates. They have area A and spacing d. The plates are then electrically isolated so that no charge can be added or taken away. A good conductor of thickness d/2 is placed in between the two plates, as shown. How about the electrical stored energy, using the formula U = (1/2) QV? What was it before, and what is it now?

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Imagine that two parallel plates are charged to achieve a voltage difference Vo between the plates. They have area A and spacing d. The plates are then electrically isolated so that no charge can be added or taken away. A good conductor of thickness d/2 is placed in between the two plates, as shown. How about the electrical stored energy, using the formula U = (1/2) QV? What was it before, and what is it now?

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Electrostatic Potential and Capacitance

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