A solid cylindrical conductor is supported by insulating disks on the axis of a conducting tube with outer radius Ra = 6.75 cm and inner radius Rb = 5.05 cm. The cenral conductors and the conducting tube carry equal currents of I = 2.25 A in opposite directions. The currents are distributed uniformly over the cross sections of each conductor. What is the value of the magnetic field at a distance r = 5.86 cm from the axis of the conductor tube?