762 



BELL SYSTEM TECHNICAL JOURNAL 



A and B are given by 



4 



A = g— ^^^'-/^ cos ^d^, 

 Jo 



B = f e-""^'"!^ sin ^d^. 

 Jo 



With a disturbing current / = e~^^ in wire 1, the induced voltage 



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r 



Fig. 2 — Plot of the integral B as a function of r for different values of 5. 



