The dingram shows the arrangement of three small uniformly charged spheres \( A, B \) and \( C \...

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The dingram shows the arrangement of three small uniformly charged spheres \( A, B \) and \( C \). The atrows indicate the direction of the electrostatic forces acting between the spheres (for exsmple, the left atxow on sphere \( A \) indicates the electrostatic force on sphere \( A \) due to sphere \( B \) ). At least two of the spheres sue positively charyed. Which sphere, if any, could be negntively charged?
(A) Spherres \( A \)
(B) Sphere \( \boldsymbol{B} \)
(C) Content not found
(D) Norne of the spheres
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