Is the given figure 10 and 1b? What is the cross-sectional area of each air gap? What is the width of each air gap? What is the effective diameter of the rotor core? A. 18cm^2, 0.05cm, 4cm B. 18cm^2, 0.05cm, 4cm C. 18cm^2, 0.05cm, 4cm D. 18cm^2, 0.05cm, 4cm