Three point charges Q 1 , Q 2 , and Q 3 are arranged to form an

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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 Qtest 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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