Magnetic Effect of Electric Current

• The space surrounding a magnet where its magnetic force is exerted is called Magnetic Field.
• Magnetic Field Lines are imaginary lines that represent the direction of the magnetic field.
• Characteristics of magnetic field lines

  • Emerge at N-pole and merge at the S-pole.
  • They are closed corves
  • They never intersect
  • Crowded at the poles and far apart near the middle.
• Right Hand Thumb rule is used to find the direction of magnetic field around a straight conductor.
• Right Hand Thumb rule is used to find the direction of magnetic field around a straight conductor.
• Magnetic Field Lines around a Circular Coil are concentric circles and the intensity is maximum at the centre.
• A solenoid is a coil of many turns of insulated wire wrapped in a cylindrical shape
• Magnetic Field inside the solenoid is uniform and parallel but is non uniform outside the solenoid.
• Magnetic Field due to a current carrying solenoid is directly proportional to the number of turns and the current passing through it.
• Magnetic Field due to a current carrying solenoid depends on the nature of the core material used.
• Electromagnet is a temporary magnet that is created by the magnetization of a magnet material by placing it inside an current carrying solenoid
• Advantages of electromagnets:

  1. Can be magnetized and demagnetized by switching on and off the current
  2. Strength can adjusted according to need
  3. Polarity can be reversed