Four charges `Q_(1), Q_(2), Q_(3)` and `Q_(4)` of same magnitude are fixed along the x axis at `x=-2a, -a, +a` and `+2a`, respectively. A positive charge q is placed on the positive y axis at a distance `b gt 0`. Four options of the signs of these charges are given in List I. The direction of the forces on the charge q is given in List II. Match List I with List II and select the correct answer using the code given below the lists.

`{:(,"List-I",,,"List-II"),((P),Q_(1)","Q_(2)","Q_(3)","Q_(4) "all positive",,(1),+x),((Q),Q_(1)","Q_(2) " positive, "Q_(3)","Q_(4)" negative",,(2),-x),((R),Q_(1)","Q_(4)" positive ,"Q_(2)","Q_(3)" negative",,(3),+y),((S),Q_(1)","Q_(3)" positive , "Q_(2)","Q_(4)" negative",,(4),-y):}`

Options

A. `{:(,P,Q,R,S),(,3,1,4,2):}`
B. `{:(,P,Q,R,S),(,4,1,3,2):}`
C. `{:(,P,Q,R,S),(,3,1,2,4):}`
D. `{:(,P,Q,R,S),(,4,2,1,3):}`

Answer

A

Explanation

(i) Component of forces along X-axis will vanish. Net force along positive Y-axis

(ii) Component of forces along Y-axis will vanish. Net force along positive X-axis

(iii) Component of forces along X-axis will vanish. Net force along negative Y-axis

(iv) Component of forces along Y-axis will vanish. Net force along negative X-axis