Which of the following four figures correctly show the forces that three charged particles exert on each other?

(i) is incorrect because '1' and '2' are repelled by '3'. So '1' and'2' have charge of same nature. Hence they should repel each other. For this reason, (ii) is correct.(iii) is correct if charge on '2' and '3' is of same nature and on'1' opposite of them.(iv) All attraction is not possible.