Problem 2: Four metal balls, A, B, C and D of equal mass carry non-zero charges QA, QB, Qc and Qp, respectively, where QA > 0. When suspended in different combinations from rigid horizontal supports by insulating threads of equal lengths, the balls are deflected from the vertical by the electric forces they exert on each other, as shown in the three figures below. Fig. 2.41 Which of the following could be true? Ов < 0, (A) Qc = -QA < 0, (B) Qc = Qa > |QB\, (C) Qc = -QA < 0, (D) Qc = Qa < |QB\, (E) Qc = QA < |QB\; QD >0 Qp >0 Ов > Qc > 0, Qp <0 Qp >0 QD <0 Ов <0, Ов <0, Ов > 0,

Problem 2: Four metal balls, A, B, C and D of equal mass carry non-zero charges QA, QB, Qc and Qp, respectively, where QA > 0. When suspended in different combinations from rigid horizontal supports by insulating threads of equal lengths, the balls are deflected from the vertical by the electric forces they exert on each other, as shown in the three figures below. Fig. 2.41 Which of the following could be true? Ов < 0, (A) Qc = -QA < 0, (B) Qc = Qa > |QB\, (C) Qc = -QA < 0, (D) Qc = Qa < |QB\, (E) Qc = QA < |QB\; QD >0 Qp >0 Ов > Qc > 0, Qp <0 Qp >0 QD <0 Ов <0, Ов <0, Ов > 0,