In this scenario I handwave the initial explosion. Other answers have covered that, and I find the story would not be as interesting if you turn on the field and the Earth explodes, killing everyone. The end. Here is what happens without the explosion:
There will be huge amounts of lightning as nearby electrons shoot into the field. This will create an area of glowing hot plasma surrounding the field. You can forget about even getting into the field, the lightning will give you a fatal shock to your heart before you can even get to it. That is, if you somehow survive the intense heat and the thunderclap.
After checking whether plasma is conductive, I realized that the lightning will keep expanding. The electrons will have an easy path through the plasma to the field, so the storm will engulf the entire planet and steal all of the electrons. Then, I am tempted to guess that the effect will stretch to the solar wind, and there will suddenly be lightning shooting from the Sun to the Earth like giant Tesla Coils. However that part is purely speculative, I don't know if it would extend to the Sun, the solar wind might not be dense enough.