The towers of transmission lines are 38m tall. They are spaced 280m apart and are joined at their tops by single ground wire of surge impedance 520W. The surge impedance of the towers themselves is 135W. Lightning strikes the ground wire 100m from a tower. The stroke current rises to a peak of 50kA in 1.5 μs.
Determine the voltage of the closest tower 0.75 μs after the lightning contacts the ground wire. Assume the impedance of the lightning channel is 1500W and the footing resistance 25W. Waves on the tower travel at 90% of the speed of light.

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Let the two towers be A B Lightning strikes the ground wire at 100... View the full answer