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do you mean magnetic field is out of the paper??
Dear rohit ,
the force on the current carrying wire is given by f = i l x B applying the result on every infinitesimally small part of ring and treating it as a wire. take a wire of length dl then force on it is i dl B outwards from the loop . at every point the direction is same , outwards. therefore the forces cancels out. the diametrically opposite points nullify the effect of their respective points. so force is zero.
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