Question

Three point charges q₁ ,q₂ and q₃ are taken such that when q₁ and q₂ are placed close together to form a single point charge, the force on q₃ at distance L from this combination is a repulsion of 2 unit in magnitude. When q₂ and q₃ are so combined the force on q₁ at distance L is an attractive force of magnitude 4 unit. Also q₃ and q₁ when combined exert an attractive force on q₂ of magnitude 18 unit at same distance L. The algebraic ratio of charges q₁ ,q₂ and q₃ is 

(a) 1:2:3 

(b) 2:- 3:4 

(c) 4:- 3:1 

(d) 4:- 3:2

Answer 1

Correct option: (d) 4 : - 3: 2

Answer 2

(c) 4 : -3 : 1