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Grade 12IIT JEE Entrance Exam

First tell me the meaning of question and then solve it

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Profile image of Nikhil Gupta
8 Years agoGrade 12
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1 Answer

Profile image of Arun
6 Years ago
Any third charge in equilibrium with q 
1
​ 
 andq 
2
​ 
  must lie on the line connecting q1 and q2.
See the diagram.
The line is given by the equation,
y−3=−3/4×(x−0)⇒4y+3x=12
∴ the points represented by position vector in option (a) and (b) will lie on the above line, so we can say that these two may be the position vector q 
3
​ 
 .