High-frequency signals are often transmitted along a coaxial cable, such as the one shown in the figure below. For example, the cable TV hookup coming into your home is a coaxial cable. The signal is carried on a wire of radius R1 while the outer conductor of radius R2 is grounded (ie, at V=OV). An insulating material (with constant k = 3.4) fills the space between them, and an insulating plastic coating goes around the outside. Calculate the capacitance per meter of a cable having R1=4.7 mm and R2=7.69 mm Coaxial cable R R