RiJzcTRic ciRcrrr theory 



53 



velocity of light. The error, however, in neglecting the inductance 

 in the case of long cables is appreciable only near the head of the wave 

 provided we confine attention to d.c. or low frequency voltages. This 

 point will be discussed and explained more fully in connection witii the 

 transmission line. 



The current, while linite, is negligibly small until t reaches the 



0.5 1.0 15 2.0 2.5 3.0 5i5 40 <1S "io 



Fig. 3 — Current in non-inductive cable (G = 0) unit e.ni.f. applied 



1.0 2,0 3.0 4,0 5.0 6.0 7.0 8.0 90 lOO 



Fig. 4 — Voltage in non-inductive cable (G = 0) unit e.m.f. applied 



value 0.2. In the neighborhood of this point it begins to build up 

 rapidly; reaches at r = 2 its maximiun value 



VV xR V 2 Vtt xR 



(0.429) 



and then l)egins to decrease, ultimately dying away in accordance 

 with the formula 



