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An equipotential surface that surrounds a point charge q has a potential of 516 V and an area of 1.01 m2. Determine q

Two capacitors are identical, except that one is empty and the other is filled with a dielectric (k = 4.5). The empty capacitor is connected to a 15 -V battery. What must be the potential difference across the plates of the capacitor filled with a dielect...