how can you find the direction of a magnetic field at a point through which the magnetic line of force is given
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as magnetic lines of force (or magnetic field lines are always in loops) you must draw a tangent at that particular point in the direction of the field to know the direction of magnetic force.
1) magnetic field lines are always in loops as they must end somewhere unlike electric fields which can extend upto infinity because of the existence of a monocharge.But for magnets monopoles donot exist practically so if the originate somewhere they must end somewhere
2)Magnetic field lines always originate at North pole and end at south pole(actually they also continue inside the magnet)
The above shown figure should clear most of your doubts
1) magnetic field lines are always in loops as they must end somewhere unlike electric fields which can extend upto infinity because of the existence of a monocharge.But for magnets monopoles donot exist practically so if the originate somewhere they must end somewhere
2)Magnetic field lines always originate at North pole and end at south pole(actually they also continue inside the magnet)
The above shown figure should clear most of your doubts
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