(c) (5%) obtain the loss tangent of this material. What's the physical meaning of the loss tangent?

3. A long straight conducting wire has a circular cross-section of radius R and carries a current I. Inside the conductor, there is a cylindrical hole of radius a whose axis is parallel to the axis of the conducting wire and is Iocated at a distance b from it. Calculated the magnetic field inside the hole. (15 pts).