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Four identical particles, each having charge q=28 micro coulomb , are fixed at the corners of...

Four identical particles, each having charge q=28 micro coulomb , are fixed at the corners of a square of side L=25cm . A fifth point charge Q=-28 micro coulomb lies a distance z=7cm along the line perpendicular to the plane of the square and passing through the center of the square as shown in Figure 3. Calculate the force exerted by the other four charges on -Q ?

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