a very long, straight horizontal wire carries a current such that 8.25×1018 electrons per second pass any given point going from west to east.

The answer would be d

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.