IN CYLINDRICAL CONDUCTORS, ETC. 
79 
OOOOOOOOOOOOOOQO 
Eig. 6. Single layer 16-wire system. 
Curve A slrows the distribution of effective resistance produced by eddy-current losses due to tie proximity 
of tie wires. 
Curve B siows tie distribution of tie losses ttrougiout tie system. 
The value of u n when n = go is obtained as follows. Consider a long strip of width 
l composed of N7 parallel wires each carrying a current I. The field at a distance x 
from the edge in this strip is 2NI log (l — x)jx. and the mean square field is 
-i 6 NT (i-i + i-i + 
= lVN 2 r. 
H m 2 = 4N 2 ! 2 
U r 
But since N = 1 JD, 
so that 
u n =‘-§-7r 2 = 3 ‘2899. 
