1. The problem statement, all variables and given/known data So I'm working on question five from my book. The book references a earlier problem, which you'll find below for further reviewing purposes. 2. Relevant equations 3. The attempt at a solution I apologize for posting the question as a picture. But given my situation, it is best. If you have difficulty reading it let me know. Alright so I'm starting to panic here a bit. The questions is from An introduction to Electrical Machines and Transformers Second Edition by George McPherson and Robert D. Laramore. I feel a bit lost in the class. The prerequisite for the class was electric magnetic field theory. I didn't take generalized machine theory in my undergraduate, which would have been useful for this class. It was a requirement for my undergraduate. Anyways. I have attempted to find the solutions manual for this book. The book was published 25 years ago. Searches for most of the problems from the book lead to nothing in Google. It appears that the solutions manual was never published neither. So finding the solution and attempting to understand the solution is out of the question it would seem. Now that, that option is out of the way, the only way I can solve this problem is to understand the material and with assistance from others. Looking through my class notes, I can't even find del_FR or del_SR or beta or |R|. So my class notes are of no use to me. The chapter from which the problems is over 100 pages long. I have found some of these symbols in the chapter and have read the sections but it's of no help in solving the problem. Any help on how to solve this problem would be greatly appreciated thanks.