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Electromagnetic Induction

  • Permanent magnets: The substances that retain their ferromagnetic property at room temperature for a long period of time are called permanent magnets.
  • Electromagnets: Electromagnet is a magnet consisting of soft iron core with a coil of insulated wire wound round it. When a current flows through the wire, the core becomes magnetized.
  • Solenoid: It is consist of an insulating long wire wound in the form of helix. Its length is very large as compare to the its diameter. 



  • A current carrying the rod experiences a force when placed between two poles of strong magnets. The direction of force exerted on the rod is related with the direction of current. 
  • Magnitude of magnetic force depends upon three factors:
    (1) FI  (…

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