What ratio is needed for the cable, Electrical Engineering

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Q. If b and a are the radii of the outer and inner conductors, respectively, of a coaxial cable using a polyethylene dielectric (ε_r = 2.26), what ratio b/a is needed for the cable to have a characteristic impedance ¯ Z0 = R0 = (60/√εr ) ln (b/a) of 50?

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