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                          Electromagnet A electromagnet consists of a core of soft iron wrapped with a coil of insulated copper wire When s current is flowing through a solenoid , a strong magnetic field is produced inside a solenoid which can be used to magnetise a piece   of magnetic material (like soft iron ) when placed inside the coil . the magnet so formed is called as electromagnet.     Magnetism in medicine:--   ·      An electric current is always produced a magnetic field. ·      Every weak ion current produces a magnetic field. Every weak ion current that travel along the nerve cells in our body produce a magnetic field. ·      When we touch something , our nerve cells carry an electric impulses to the muscles we need to use. ·      This impulse produce a temporary magnetic field. These magnetic field are very weak and are one-billionth of the earth’s magnetic field. ·      Hearth and brain are the two main organs of the human body to produce the magne

  Magnetic field due to a current in a solenoid   Solenoid:-- Solenoid is a coil of many circular turns of insulated copper wire which are wrapped closely in the shape of a cylinder is called a solenoid. Magnetic field lines of the magnetic field near current carrying solenoid.       A solenoid having current is used to magnetise the rod inside it       The magnetic field around the current carrying solenoid is similar to the magnetic field around the bar magnet. One end of the solenoid behaves as (or act as) magnetic north pole Other end of the solenoid behaves as (or act as)   the magnetic south pole. In the solenoid   , The magnetic field   lines are In the form of the parallel straight lines.   This shows that magnetic field is same at every points insides   the   solenoid. That is , the magnetic field is uniform inside the solenoid. A electromagnet consists of a core of soft iron wrapped with a coil of insulated copper wire When s current is