Four charges Q₁, Q₂, Q₃ and Q₄ of equal magnitude are fixed on the x-axis at x=-2a, -a, +a and +2a. A positive charge q is placed at (0,b). Match the sign configurations in List I with the direction of force on q in List II.
Physics · Electrostatic
Four charges Q₁, Q₂, Q₃ and Q₄ of equal magnitude are fixed on the x-axis at x=-2a, -a, +a and +2a. A positive charge q is placed at (0,b). Match the sign configurations in List I with the direction of force on q in List II.
List 1
(P) Q₁,Q₂,Q₃,Q₄ all positive
(Q) Q₁,Q₂ positive; Q₃,Q₄ negative
(R) Q₁,Q₄ positive; Q₂,Q₃ negative
(S) Q₁,Q₃ positive; Q₂,Q₄ negative
List 2
(1) +x
(2) -x
(3) +y
(4) -y
Options