Please answer part C thank you!

Part A An air capacitor is made by using two flat plates, each with area A, separated by a distance d. Then a metal slab having thickness a (less than d) and the same shape and What is the capacitance of this arrangement? size as the plates is inserted between them, parallel to the Express your answer in terms of the variables A, a, d, and appropriate constants. plates and not touching either plate (see the figure ( Figure 1)). C = - Aco d-a Submit Previous Answers Correct Part B Express the capacitance as a multiple of the capacitance Co when the metal slab is not present. Express your answer in terms of the variables Co, a, d, and appropriate constants. C = Cod-a Submit. Previous Answers Correct Part C Figure Discuss what happens to the capacitance in the limits a -> 0 and a + d. Essay answers are limited to about 500 words (3800 characters maximum, including spaces). 3800 Character(s) remaining