omg please help

[busdent]

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Two capacitors are identical, except that one is empty and the other is filled with a dielectric ( k= 4.70). The empty capacitor is connected to a 9.0 V battery. What must be the potential difference across the plates of the capacitor filled with a dielectric such that it stores the same amount of electrical energy as the empty capacitor?


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I cannot seem to understand this problem.. thanks

 

[a1bui]

i dont think the real OAT was that detailed...dont stress it.