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# Two positive charges of magnitude q are placed at the ends of a side 1 of a square of side 2a. Two negative charges of the same magnitude are kept at the other corners. Starting from rest, if a charge Q moves from the middle of side 1 to the centre of square, its kinetic energy at the centre of square is

$(A)\; \large\frac{1}{4 \pi \in_0} \frac{2qQ}{a} \bigg( 1- \large\frac{1}{\sqrt 5} \bigg)$