A solid conductor with radius a is supported by insulating diskson the axis of a conducting tube with inner radius b and outerradius c. The central conductor and tube carry equal currents I inopposite directions. The currents are distributed uniformly overthe cross sections of each conductor. (Young and Freedman,2013)

i.) Derive an expression for the magnitudeof the magnetic field (c) at points within the outer conductingtube (b

5. (Level 1 & 2) A solid conductor with radius a is supported by insulating disks on the axis of a conducting tube with inner radius b and outer radius c. The central conductor and tube carry equal currents l in opposite directions. The currents are distributed uniformly over the cross sections of each conductor. (Young and Freedman, 2013) Young and Freedman (Level 2 only) Derive an expression for the magnitude of the magnetic field (c) at points within the outer conducting tube (b«r«c).