Four charges +q'+q' - q and -q are place...

Four charges +q'+q' - q and -q are placed respe tively at the four croners A,B,C and D respectively of a square of side a . Calcualte the force on a charge Q placed at the centre of the square.

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MODERN PUBLICATION-ELECTRIC FIELD-EXERCISE

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Shown in the figure <b> four point charges at the corners of a square...
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