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Q.
    ​What is magnetic field lines ? List three characterstics of magnetic field lines ? Describe an experiment to show the magnetic field lines ?
 

Dear Student,
Magnetic field lines are imaginary lines to visualize magnetic field in space. Magnetic field is a region in space where magnetic force is experienced by any object having magnetic property. The direction of force and field at any point is given by the field lines.
Characterstics of magnetic field lines -
1) makes close loop
2) do not cross each other 
3) divergance less

                     
                       
Regards

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