Voltage from a dc source is applied to an overhead transmission line by closing a switch. The end…

 Voltage from a dc source is applied to an overhead transmission line by closing a switch. The end of the overhead lines connected to an underground cable. Assume that both the line and the cable are lossless and that the initial voltage along the line is u+. if the characteristic impedances of the line and cable are 400 and 50 0, respectively, and the end of the cable is open-circuited, find in terms of u* (a) The voltage at the junction of the line and cable immediately after the arrival of the incident wave and (b) The voltage at the open end of the cable immediately after arrival of the first voltage wave.  

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