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Four charges +q,+q-q, and -q are placed ...

Four charges `+q,+q-q,` and -q are placed on X - Y plane at the points whose coordinates are `(0.5, 0), (0, 0.5), (-0.5, 0) and (0, -0.5)` respectively.

The electric field due to these charges at a point P(r,r), where `r gtgt 0. 5`, will be

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