Because of induced voltage in conductors.
Any electrical conductor in a coronal mass ejection ( plasma getting blasted off the sun) is going to have voltage introduced to it whether it’s plugged in or not.
Read about the Carrington event: [https://en.wikipedia.org/wiki/Carrington_Event](https://en.wikipedia.org/wiki/Carrington_Event)
telegraph operators would get shocked even when the telegraph was not hooked up to anything
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