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AP® Physics 1 & 2

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APPH12-KLD174

Three isolated, identical conducting spheres are suspended by insulating strings.

Sphere 1 can be moved because it is suspended from a hand. Sphere 1 has 1,000 excess electrons, Sphere 2 has 500 excess electrons and Sphere 3 has 250 excess electrons.

Initially, Sphere 1 is brought in contact with Sphere 2 then moved away. Next, Sphere 1 is touched to Sphere 3 and removed.

What is the number of excess electrons on each sphere after the two steps are completed?

A

Sphere 1 has 500 excess electrons.
Sphere 2 has 500 excess electrons.
Sphere 3 has 500 excess electrons.

B

Sphere 1 has 500 excess electrons.
Sphere 2 has 750 excess electrons.
Sphere 3 has 500 excess electrons.

C

Sphere 1 has 250 excess electrons.
Sphere 2 has 750 excess electrons.
Sphere 3 has 500 excess electrons.

D

Sphere 1 has 1000 excess electrons.
Sphere 2 has 500 excess electrons.
Sphere 3 has 250 excess electrons.