AP® Physics 1 & 2

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Electroscope - Free Electrons


Consider the electroscope shown in the image. A positively charged rod is brought near the metal ball at the top of the electroscope.

What happens to the free electrons in the electroscope?

(Electroscope_diagram. Digital image. How Well Do Different Materials Create Static Electricity? Science Buddies, n.d. Web. 27 Oct. 2015.)


The free electrons attract to the positively charged rod and collect on the surface of the metal sphere.


The free electrons are repelled by the positively charged rod and move as far away as possible, down into the metal leaves of the electroscope.


The positively charged rod causes the free electrons to be ejected from the electroscope.


The free electrons freely move about the electroscope and are randomly located.