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AP® Physics 1 & 2

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Two Actions to Reduce Force

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Two metal spheres on insulating stands have charges +4.0 nC and -8.0 nC. The spheres are spaced 5.0 cm apart. A student considers the following actions listed below.

Which TWO actions will combine to produce a net reduction in the force between the spheres by a factor of eight?

A

Move the -8.0 nC sphere until the spheres are 20.0 cm apart.

B

Move the -8.0 nC sphere until the spheres are 10.0 cm apart.

C

Connect the +4.0 nC sphere to an electrical ground.

D

Momentarily touch the +4.0 nC sphere to a neutral metal sphere of the same size.