Q1. A high-voltage coaxial cable comprises two concentric copper conductors separated by a dielectric barrier made of FEP (Fluorinated Ethylene Propylene). The inner conductor is solid, having radius a = 2.4mm. The outer conductor has inner radius b = 14.7mm and thickness t = 2mm. • The FEP dielectric has a relative permittivity of ε,= 2.1. a) The outer conductor is initially grounded, and a potential difference Vab = 25kV is applied. i) Sketch the electric field and equipotential distribution on a cross-section of the cable, labelling the most important features. ii) Calculate the capacitance per unit length of this cable in picofarads/m. iii) Show that the free charge accumulated on each conductor is ±1.6 μC/m.