Three point charges Q₁, Q₂, and Q₃ are arranged to form an equilateral triangle as shown in Figure P17.18. The signs of these charges are unknown. 

(a) A test charge Q_test is now placed at point A. If the net force on the test charge is zero, what might be the signs of Q₁, Q₂, and Q₃? Pick the correct option(s).

(i) Q₁, Q₂, and Q₃ are all positive.

(ii) Q₁, Q₂, and Q₃ are all negative.

(iii) Q₁ and Q₂ are positive, and Q₃ is negative.

(iv) Q₁ is positive, and Q₂ and Q₃ are negative.

(v) Q₁ is positive, Q₂ is negative, and Q₃ is positive.

(b) Repeat part (a), but now the test charge is placed at point B.

(c) Repeat part (a) again, but with the test charge at point C.

Figure P17.18

 

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21 Оз Ог