A current I flows axially through the walls of a very long pipe thick walled metal pipe with inner radius a and outer radius b. A cross-section of the pipe is shown in the figure below. This pipe extends very far into and out of the page. The current flows in the out-of-the-page direction and is uniformly distributed throughout walls. What is the magnetic field vector B? in the three regions rb?

Transcribed Image Text:

a b a b