Had to submit as image as it wouldn't let me paste these symbols in the answer box
hope this helps:)
-identifies an electric charge
-it can identify its polarity (positive or negative) if you compare it to a charge that you already know
-can identify the magnitude of a charge (how big of a charge it is)
Answer:
very low air pressure and that's not 100 points
There is no factor on your list of choices that has any effect.