Q4. a) Figure 3 shows the cross-sections of a dielectric-filled coaxial cable and an air- spaced twin wire line. b dielectric Figure 3(a) - Coaxial Cable Ꭰ Figure 3(b) - Twin Wire (i) Sketch the electric and magnetic field distributions on the cross-sections of each of the lines of Figure 3 when carrying a signal, indicating clearly the field directions relative to the power flux. (ii) If a reduction is needed in Zo, describe qualitatively the adjustments that could be made for each line in Figure 3 to achieve this (hint: consider first how line capacitance can be changed).