Three charges +Q1,+Q2 and Q are placed on a straight line such that Q is somewhere in between +Q1 and+Q2. If this system of charges is in equilibrium, what should be the magnitude and sign of charge q?(in terms of Q1 and Q2)

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Q. Three charges

+ Q_{1}, + Q_{2}

and

q

are placed on a straight line such that

q

is somewhere in between

+ Q_{1}

and

+ Q_{2}

. If this system of charges is in equilibrium, what should be the magnitude and sign of charge

q

Three charges + $Q_{1}$ , $Q_{2}$ and q are placed on a straight line such that $q$ some where in between + $Q_{1}$ And + $Q_{2}$ . If this system of charges is in equilibrium, what should be the magnitude and sign of charge q.

Q. Three charges +

Q_{1}, Q_{2,}

and q are placed on a straight line such that q is somewhere in equilibrium,what should be the magnitude and sign of charge q ?

Three point charges $Q_{1}$ , $Q_{2}$ and $Q_{3}$ in that order are placed equally spaced along a straight line. $Q_{2}$ and $Q_{3}$ are equal in magnitude but opposite in sign. If the net force on $Q_{3}$ is zero, the value of $Q_{1}$ is :