3. The use of superconductors has been proposed for power transmission lines. A single coaxial cable (seefigure below) could carry a power of 1.00 x 10³ MW (the output of a large power plant) at 200 kV, DC,over a distance of 1.00 x 10³ km without loss. An inner wire of radius a =superconductor Nb3Sn, carries the current I in one direction. A surrounding superconducting cylinder ofradius b = 5.26 cm would carry the return current I.(a) In such a system, what is the magnetic field at the surface of the inner1.25 cm, made from the%3Dconductor?(b) What is the magnetic field at the inner surface of the outer conductor?(c) How much energy would be stored in the magnetic field in the spacebetween the conductors in a 1.00 × 10³ km superconducting line?(d) What is the pressure exerted on the outer conductor due to the current inthe inner conductor?

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