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AP® Physics 1 & 2

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Moderate

Unequal Spheres

APPH12-FL2MEK

A student uses two metal spheres of unequal size in an experiment. Both spheres are placed on insulating stands. The small sphere has a net charge of +70 nC. The large sphere is uncharged.

As the two spheres are brought close the student sees a spark between the spheres. It is determined that the final charge on the small sphere is +30 nC.

What is the final charge on the large sphere; and what direction did electrons move when the spark occurred?

A

-40 nC; electrons moved from the small sphere to the large sphere

B

-40 nC; electrons moved from the large sphere to the small sphere

C

+40 nC; electrons moved from the small sphere to the large sphere

D

+40 nC; electrons moved from the large sphere to the small sphere