PhysicsA point charge q1=4q0 is placed at origin. Another point charge q2=−q0 is placed at x = 12 cm. Charge of proton is q0 .The proton is placed on x axis so that the electrostatic force on the proton is zero. In this situation, the position of the proton from the origin is _____________cm.

A point charge q1=4q0 is placed at origin. Another point charge q2=q0 is placed at x = 12 cm. Charge of proton is q0 .The proton is placed on x axis so that the electrostatic force on the proton is zero. In this situation, the position of the proton from the origin is _____________cm.

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    Solution:

    Let proton is at point P, for net force zero
    F1=F2K4q0×q0(12+r)2=K×q0×q0r2212+r=1rr=12
    Position is 24cm from origin

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