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[" 18.A hypothetical magnetic field exis...

[" 18.A hypothetical magnetic field existing in a region is "],[" given by "vec B=B_(0)vec e_(r)," where "vec e_(r)" denotes the unit vector "],[" along the radial direction.A circular loop of radius "a" ,"],[" carrying a current "i" ,is placed with its plane parallel to "],[" the "x-y" plane and the centre at "(0,0,d)" .Find the "],[" magnitude of the magnetic force acting on the loop."]

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