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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q1=4q2

q1=−q2

q1=−4q2

q1=q2

answer is C.

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Detailed Solution

Net force on q3 is F1+F2=0 or kq1q3(2x)2+kq2q3x2=0⇒q1=−4q2

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