I have an interesting behaviour with my electronics project. I am trying to do something like a LED array but with electromagnets instead. See the schematic below. I built the magnets myself by winding 5 meters of 0.3mm magnet wire around iron nails. I use relays for the switches. The diodes are rated for high currents.
When I pulse one of the top switches and one of the bottom switches together, I expect only one coil to get powered. BUT the interesting thing is that EVERY magnet pulses a magnetic field, just the one that SHOULD pulse has a more powerful field. I can feel that by holding a permanent magnet next to it.
Please can someone explain this to me, because I dont see how the current can enter the non-connected coils.