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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > Four charges Q1, Q2, Q3 and Q4 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 adistance b > 0. Four options of the signs of these charges are given in List I. The directionof 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.

Four charges Q1, Q2, Q3 and Q4 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 adistance b > 0. Four options of the signs of these charges are given in List I. The directionof 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.

+a and +2a −a A wooden block performs SHM on a frictionless surface with frequency Four charges Q1 q2 Q3 and Q4 of same magnitude are fixed along the x axis at x = −2a then the SHM of the block will be : v 0 ​ . The block carries a charge +Q on its surface. lf now a uniform electrlc field E is switched-on as shown