JEE (Advanced) 2013 Paper-1 Question 8

Question 8

The work done on a particle of mass m by a force, $$K \left[\frac {x}{\left(x^2 + y^2\right)^{\frac{3}{2}}}\widehat{i} + \frac {y}{\left(x^2 + y^2\right)^{\frac{3}{2}}}\widehat{j} \right]$$ (K being a constant of appropriate dimensions), when the particle is taken from the point (a, 0) to the point (0, a) along a circular path of radius a about the origin in the x-y plane is

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