24.62 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 Figure P24.62 d than d) and the same shape and size as the plates is inserted between them, parallel to the plates and not touching either plate (Fig. P24.62). (a) What а is the capacitance of this arrangement? (b) Express the capaci- tance as a multiple of the capacitance Co when the metal slab is

24.62 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 Figure P24.62 d than d) and the same shape and size as the plates is inserted between them, parallel to the plates and not touching either plate (Fig. P24.62). (a) What а is the capacitance of this arrangement? (b) Express the capaci- tance as a multiple of the capacitance Co when the metal slab is