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[" 9.The work done on a particle of mass...

[" 9.The work done on a particle of mass "m" by a force,"],[ K[(x)/((x^(2)+y^(2))^(3/2))hat i+(y)/((x^(2)+y^(2))^(3/2))hat j]" (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 "],[[" (a) "(2K pi)/(a)," (b) "(K pi)/(a)],[" (c) "(K pi)/(2a)," (d) "0]]

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