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Home  >>  AIMS  >>  Class12  >>  Physics  >>  Electric Charges and Fields
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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

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$(A)\; \large\frac{1}{4 \pi \in_0} \frac{2qQ}{a} \bigg( 1- \large\frac{1}{\sqrt 5} \bigg)$
Hence A is the correct answer.
answered Jun 6, 2014 by meena.p
 

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