Question 153: Electrostats & Capacitance

Question

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 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.

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

Accepted Answer

(P) Component of forces along x-axis will vanish. Net force along positive y-axis.
(Q) Component of forces along y-axis will vanish. Net force along positive x-axis
(R) Component of forces along x-axis will vanish. Net force along negative y-axis.
(S) Component of forces along y-axis will vanish. Net force along negative x-axis

Answer

P-3, Q-1, R-4, S-2

Answer

P-4, Q-2, R-3, S-1

Answer

P-3, Q-1, R-2, S-4

Answer

P-4, Q-2, R-1, S-3

Electrostats & Capacitance

Choose the correct answer: