Discussion Forum



1)

Four charges Q1, Q2, Q3 andQ4 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>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. 

 2732021194_m13.JPG

2732021842_m14.JPG


A) P:3,Q:1,R:4,S:2

B) P:4,Q:2,R:3,S:1

C) P:3,Q:1,R:2,S:4

D) P:4,Q:2,R:2, S:3

Answer:

Option A

Explanation:

(p) Component of forces along x-axis  will vanish .Net force along positive Y-axis

2732021648_p1.JPG

(Q)   Component  pf forces along y-axis will vanish .Net force along the positive x-axis

273202178_p2.JPG

  (R) 

 Component of forces along x-axis will vanish .Net force along negative y-axis

273202163_p3.JPG 

(S)  Component of force along y-axis will vanish. Net force along the negative x-axis

2732021837_p4.JPG