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Four charges Q 1 , Q 2 , Q 3 and Q 4 of same magnitude are fixed along the x-axis at x = –2a, –a, +a and +2a, respectively. A positive charge q is placed on the positive y axis at a distance b > 0. Four options of the signs of these charges are given in List I. The direction of the forces on the charge q is given in List II. Match List I with List II and select the correct answer using the code given below the lists. Q 1 Q 2 Q 3 Q 4 (–2a, 0) (–a, 0) (+a, 0) (+2a, 0) q (0, b) List I List II (P) Q 1 , Q 2 , Q 3 , Q 4 all positive (1) + x (Q) Q 1 , Q 2 , positive; Q 3 , Q 4 negative (2) – x (R) Q 1 , Q 4 , positive; Q 2 , Q 3 negative (3) + y (S) Q 1 , Q 3 , positive; Q 2 , Q 4 negative (4) – y Code :
- P-3, Q-1, R-4, S-2
- P-4, Q-2, R-3, S-1
- P-3, Q-1, R-2, S-4
- P-4, Q-2, R-1, S-3
Correct answer: P-3, Q-1, R-4, S-2
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