Question

Mid way between the two equal and similar charges, we placed the third equal and similar charge. Which of the following statements is correct, concerning to the equilibrium along the line joining the charges 

(A) The third charge experienced a net force inclined to the line joining the charges. 

(B) The third charge is in stable equilibrium. 

(C) The third charge is in unstable equilibrium. 

(D) The third charge experiences a net force perpendicular to the line joining the charges. 

Answer 1

Correct Option (B) The third charge is in stable equilibrium.  

Explanation:

The charge in the middle experiences force along the line. The equilibrium is stable along the line connecting charges while The equilibrium is unstable along the line perpendicular to the line of charges 

∴ Only option B is correct (given consider equilibrium only along line joining charges)