gary and devonte are doing an experiment with an electroscope. they bring a negatively charged rod close to the top of a charged electroscope. the two metal pieces of the electroscope were spread apart already, but now they move farther away from each other. gary says that the experiment proves that the electroscope had a negative charge before they started experiment, but devonte disagrees and said it must have had a positive charge since the metal pieces moved farther away. who is right and why?

the electroscope had a positive charge before the experiment started. the negatively charged rod attracts the electrons in the electroscope and makes the metal pieces spread further apart.

the electroscope had a positive charge before the experiment started. the negatively charged rod repels protons and makes the metal pieces spread further apart.

the electroscope had a negative charge before the experiment started. when the negatively charged rod comes near the electroscope more electrons are repelled down to the metal pieces and the metal pieces move farther away from each other.

the electroscope had a negative charge before the experiment started. the negatively charged rod attracts electrons and causes the metal pieces to move further apart.