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Two simiilar spheres having q and -q charge are kept at a certain distance F force acts between the two If in the middle of two spheres another similar sphere having q charge is kept then expirience a force in magnitude and direction as
Dear pallavi
let the initial distance is d
F= k qq/d2
if a third sphere is placed between then sphere having charge q repel it and spehere having charge -q attract it.
force by q charged sphere =F1=k qq/(d/2)2
=4k qq/d2 =4F ( from +q to -q)
force by -q charged sphere =F2 =k qq/(d/2)2
=4k qq/d2 =4F (from +q to -q)
so net force = 4F + 4F =8F
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