1.

Four charges equal to ? Q are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium the value of q is                                      [AIEEE 2004]

A.                    \[-\frac{Q}{4}(1+2\sqrt{2})\]
B.                                      \[\frac{Q}{4}(1+2\sqrt{2})\]
C.                    \[-\frac{Q}{2}(1+2\sqrt{2})\]                                     
D.            \[\frac{Q}{2}(1+2\sqrt{2})\]
Answer» C.                    \[-\frac{Q}{2}(1+2\sqrt{2})\]                                     


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