The main question stems from the answer for this one:
If I have a light year long rod and push it on one end, how long would it take for the other end to move?
Still Unsure of this answer.
If I had 2, light-year long conductive rods, with a voltmeter attached at the ends then applied a voltage to it, how long would it take for the voltmeter to read the voltage?
Resources/tutorials/wiki pages please for this as well. Thanks!