Work Done by Force K\left[ {{x \over {{{({x^2} + {y^2})}^{3/2}}}}\hat i + {y \over {{{({x^2} + {y^2})}^{3/2}}}}\hat j} \right]


[JEE Advanced 2013]


The equation of the circle is x2+y2=a2


Hence, (D)

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