Class 10 Physics Magnetic Effects of Electric Current Magnetic Field around a Bar Magnet

Magnetic Field around a Bar Magnet

  • A magnet always exerts a influence around the region surrounding it. This region is called the Magnetic Field.
  • Magnetic Field has both direction and quantity.
  • The fields always emerge out of the North pole and always merge into the South pole
  • Inside the magnet, the field is from the south pole to the north pole, ie merge into the south pole and emerge out of the north pole.

  • The strength of the magnetic field is determined by the closeness of the field lines.
  • If the lines are closer and crowded, it means that the strength of the magnetic field is high and exerts a strong force on a magnet which is brought in its proximity.
  • If the lines are farer and less crowded, it means that the strength of the magnetic field is relatively low and exerts a weaker force on a magnet which is brought in its proximity.
  • When a magnetic compass is brought in the proximity of a bar magnet, it deflects and always points in the north-south direction.
  • When iron filing are brought in the vicinity of a bar magnet, they arrange themselves along the field lines.
  • The magnetic field lines are such that they never cross each other. If they did cross at a certain point, it means that at that point, the compass needle would point towards two directions, which is logically incorrect.

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