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Magnetic field and field lines:Let us discuss about magnetic field.
A.Magnetic field:- The region around a magnet where the force of attraction or repulsion can be detected is called magnetic field. Magnetic field around a magnet can be detected by using a magnetic compass.
B.Magnetic field lines:-Magnetic field lines are the paths around a magnet along which the north pole of a magnetic compass needle tends to move.The magnetic field lines around a magnet can be observed by sprinkling iron filings around a magnet. It can also be observed by moving a magnetic compass around a magnet.1.The magnetic field lines emerge at the North Pole and merge at the South Pole.2.The magnetic field lines are closer at the poles. 3. The magnetic field lines do not intersect each other.
Magnetic field due to a current carrying conductor:-If a magnetic compass is placed near a conductor carrying current wire, the needle is deflected. This shows that a conductor carrying current has a magnetic field around it.If the direction of the current is from north to south, the deflection of the magnetic needle is towards the east.If the direction of the current is from south to north, the deflection of the needle is towards the west.The magnetic field around a current carrying straight conductor is in concentric circles. It can be observed by passing a current carrying straight conductor through a cardboard and sprinkling iron filings on it.