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A parallel-plate capacitor has capacitance CC = 12.5 pFpF when the volume between the plates is...

A parallel-plate capacitor has capacitance CC = 12.5 pFpF when the volume between the plates is filled with air. The plates are circular, with radius 3.00 cmcm. The capacitor is connected to a battery and a charge of magnitude 25.0 pCpC goes onto each plate. With the capacitor still connected to the battery, a slab of dielectric is inserted between the plates, completely filling the space between the plates. After the dielectric has been inserted the charge on each plate has magnitude 45.0 pCpC.

1. What is the dielectric constant KK of the dielectric?

2. What is the potential difference between the plates before the dielectric has been inserted?

3. What is the potential difference between the plates after the dielectric has been inserted?

4. What is the electric field at a point midway between the plates before the dielectric has been inserted?

5. What is the electric field at a point midway between the plates after the dielectric has been inserted?

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