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A point charge +q is placed at a distanc...

A point charge `+q` is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is

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Force on charge q due to the thread, `F=((2K lambda)/r).q` By Newton's III law, every action has equal and opposite reaction, so force on the thread `= (2 K lambda)/r. q`
(away from point charge)
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RESONANCE ENGLISH-ELECTROSTATICS-HLP
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