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Four point charges q, -2q, -q and 2q are...

Four point charges q, -2q, -q and 2q are placed at points (0,0,0) m , `(sqrt(2), 0,0) m, (sqrt(2), sqrt(2),0)m " and " (0, sqrt(2) , 0)` m respectively . The electric field at point `((1)/(sqrt2), (1)/(sqrt2),0) m " is " (q=1muC)`

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