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Magnetic field and Field lines The unit of magnetic fields strength is oersted. 😀Q.. Why does a compass needle get deflected when brought near a bar magnet?  😀Q.. Why do the iron fillings arrange in such a pattern? What does this pattern demonstrate?  The magnetic exerts its influence in the region surrounding it. Therefore the iron fillings experience a force.thus exerted makes iron failings to arrange in a pattern.  The reason surrounding a magnet in which the force of the magnet can be detected, is said to have a magnetic field.   The line along which the iron filing a align themselves represent magnetic field lines.  Magnetic field is a quantity that has both direction and magnitude.   The direction of the magnetic field is taken to be the direction in which the North Pole of the compass needle moves inside it. The reactive strength of the magnetic field is shown by the degree of closeness of the field lines.  The field is stronger, that ...
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