A current carrying, straight wire is kept along the axis of a circular loop carrying a current. The straight wire.

There won’t be any magnetic force acting on the wire in this case because, according the Cork-Screw rule, the magnetic field due to the straight wire will be parallel or anti parallel to the direction of current in the loop, thus creating an angle of 0 or ϖ with the direction of current.


According to F = ILBsinϴ


Where


I is the current,


L is the length of the wire


B is the magnitude of the magnetic field.


for ϴ = 0 or ϖ, F= 0.

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