Let S = 100 mm², d = 3 mm, and ∈_r = 12 for a parallel-plate capacitor.

(a) Calculate the capacitance.

(b) After connecting a 6-V battery across the capacitor, calculate E, D, Q, and the total stored electrostatic energy.

(c) With the source still connected, the dielectric is carefully withdrawn from between the plates. With the dielectric gone, recalculate E, D, Q, and the energy stored in the capacitor.

(d) If the charge and energy found in part (c) are less than the values found in part (b) (which you should have discovered), what became of the missing charge and energy?