Four corners each equal to Q are placed at the four corners of the square and a charges q is placed at the centre of the square. If the system is in equilibrium then the value of q is
(1)Q/2(1+2√2)
(2)-Q/4(1+2√2)
(3)Q/4(1+2√2)
(4)-Q/2(1+2√2)
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