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Two identical point charges, q each, …

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Two identical point charges, q each, are kept 2m apart in air. A third point charge Q of unknown magnitude and sign is placed on the line joining the charges such that the system remains in equilibrium. Find the position and nature of Q.

    • Posted by Ramesh Prasad 5 years, 6 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Varsha Thory 4 years, 2 months ago

    Separation between both q charges is l and let us say Q is x m away from one charge .so it will be l-x away from another charge It is given that the system is in equilibrium, net force on each charge is zero. We know ,Fields on Q due to both charges having magnitude q are equal. kq/x^2=kq/(l-x)^2 x^2=(l-x)^2 x=l/2 x=1m Also force on charge q is zero . KqQ/l^2+kqq/(l-x)^2=0 -q/4=Q

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