How Many Extra Electrons Are On This Charged Tape?

Photo: Rhett Allain. Electrically charged tape

Maybe you haven’t tried this before — but it’s kind of awesome. If you put two clear sticky tapes together and pull them apart, they will become electrically charged. It produces a nice effect that even works when the air humidity is higher than normal.

Of course, electric charge is conserved, so when you pull these apart the bottom tape becomes negative and the top tape is…