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The diagram shows the arrangement of thr...

The diagram shows the arrangement of three small uniformally charged spheres, `A,B` and `C`. The arrow indicate the direction of the electrostatic forces acting between the spheres (for example, the left arrow on sphere `A` indicates the electronstatic force on sphere `A` due to sphere `B`). At least two of the spheres are positively charged. Which sphere, if any, could be negatively charged?

A

sphere A

B

sphere B

C

sphere C

D

no sphere

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The correct Answer is:
A
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