AP® Physics 1 & 2

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Electroscope - Free Electrons

APPH12-ENFVJ6

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.)

A

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

B

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.

C

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

D

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