Q1) Coaxial cable with length of 20m, along z axis, with a-2mm, b-4mm, c-5mm as shown in cross section figure. The space between a and b is filled by dielectric material with Er = 5. Find: 1) the capacitance of this cable. 2) the capacitance of a portion of this cable bounded by 0 <Ø<180°, L=20m.
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