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Created for Albert.io. Copyright 2017. All right reserved.

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 $+70 \text{ nC}$. 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 $+30\text{ nC}$.

Which of the following values indicates the final charge on the large sphere; and what direction did electrons move when the spark occurred?

A

$-40\text{ nC}$; electrons moved from the small sphere to the large sphere.

B

$-40\text{ nC}$; electrons moved from the large sphere to the small sphere.

C

$+40\text{ nC}$; electrons moved from the small sphere to the large sphere.

D

$+40\text{ nC}$; electrons moved from the large sphere to the small sphere.

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