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Q.

Three charged particles are placed on a straight line as shown in figure. q1 and q2 are fixed, but q3 can be moved. Under the action of the forces from q1 and q2, q3 is in equilibrium. What is the relation between q1 and q2? 

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a

q1=q2

b

q1=4q2

c

q1=−4q2

d

q1=−q2

answer is C.

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Detailed Solution

 Net force on q3 is F1+F2=0

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or kq1q3(2x)2+kq2q3x2=0⇒q1=−4q2

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