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# Two Actions to Reduce Force

APPH12-ZFEQJN

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

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

A

Move the $-8.0\text{ nC}$ sphere until the spheres are $20.0\text{ cm}$ apart.

B

Move the $-8.0\text{ nC}$ sphere until the spheres are $10.0\text{ cm}$ apart.

C

Connect the $+4.0\text{ nC}$ sphere to an electrical ground.

D

Momentarily touch the $+4.0\text{ nC}$ sphere to a neutral metal sphere of the same size.