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JEE Adv. 2013: $K\left[ {\frac{x}{{{{({x^2} + {y^2})}^{3/2}}}}\hat i + \frac{y}{{{{({x^2} + {y^2})}^{3/2}}}}\hat j} \right]$

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Solution

The equation of the circle is x2+y2=a2

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Hence, (D)