2. A small solid conductor with radius a is supported by insulating, nonmagnetic diskson the axis of a thin-walled tube with inner radius b. The inner and outer conductorscarry equal currents i in opposite directions. (a) Use Ampere's law to find themagnetic field at any point in the volume between the conductors. (b) Write theexpression for the flux dPB throughAa narrow strip of length 1 parallel toS2the axis, of width dr, at a distance r2.0 mH5.0 μFRfrom the axis of the cable and lyingin a plane containing the axis. (c)Integrate your expression from part (b) over the volume between the two conductorsto find the total flux produced by a current i in the central conductor. (d) Show thatthe inductance of a length 1 of the cable is L = 1In (2). (e) Calculate the energy2nstored in the magnetic field for a length 1 of the cable. (Problem 30.48)ell

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