Many readers will have seen this image or something similar. Fluorescent tubes are connected to earth near a high-voltage electricity cable and the tubes glow “magically” without any obvious electrical connection.
Quiz question: is the energy transferred to the fluorescent tube from the electricity cable by
a) electrical current flowing from the cable to the ground via the air and tube due to the high voltage
b) electro-magnetic induction of a voltage at the top end of the fluorescent tube by an electro-magnetic field generated by the alternating current in the cable
or c) something else (suggest what else it might be with your answer)
Bonus question: If the same cable was placed underground at the same distance below ground from the top of the fluorescent tube as it was above it to start with, with the same voltage and current passing through it, would the fluorescent tubes still glow? (Assume that the cable is electrically insulated and that the ground is not made of anything too surprising.)
The floor is yours.