A current carrying straight wire is carrying current into the plane of a paper. It is placed at X The correct pattern of magnetic field lines is
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The figure shows that, magnetic field due to straight wire is either parallel or antiparallel to the current flow in loop depending on direction of current in wire. Thus force FF exerted by this magnetic field BB is
F = Idl × B =IdlBsinθ=0[∵θ=0or180]
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