MAGN'KTIC I)i:si(;\ OF UKLAYS 



47 



0.8 

 0.6 



■:(R 



0.1 

 0.08 



0.06 

 0.04 



0.01 0.02 0.04 0.06 0.1 0.2 0.4 0.6 0.8 1 



X/C 



??; = (n 



when — < 1, 

 rm 



when — = 1, 

 rm 



when ■ — > 1, 

 rm 



l + 2-(l + 4/1+^ 



(R 



4 6 6 10 



y \rm/ 



01 = 



(n 



(R = 



+ 



K \rm/ 



\/i^'- 



if cylinders are not circular, let /' = ^ — X perimeter. 

 Fig. 13 — Reluctance between side surfaces of end -on coaxial cj'lindeis. 



