A few electric field lines for a system of two charges $Q_{1}$ and $Q_{2}$ , fixed at two different points on the $x$ -axis are shown in the figure. These lines suggest that

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Important Questions on Coulomb's Law and Electric Field

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JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 1 - Coulomb's Law and Electric Field>Archives>Q 1

Four charges $Q_{1}, Q_{2}, Q_{3}$ and $Q_{4}$ of same magnitude are fixed along the $x$ axis at $x = - 2 a, - a, + a$ and $+ 2 a,$ 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 the lists.

Question Image

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.	$- y$