A parallel-plate capacitor has capacitance C = 15.7 pFwhen the volume between the plates is filled with air. The platesare circular, with radius 2.50 cm. The capacitor is connected to abattery and a charge of magnitude 28.0 pC goes into each plate.With the capacitor still connected to the battery, a slab ofdielectric is inserted between the plates, completely filling thespace between the plates. After the dielectric has been inserted,the charge on each plate has magnitude 45.0 pC.
(a) What is the dielectric constant K of thedielectric?
(b) What is the potential difference between the plates beforeand after the dielectric has been inserted?
(c) What is the electric field at a point midway between theplates before and after the dielectric has been inserted?
