Class 12 Physics Electromagnetic Induction Varying Magnetic Field

Methods of producing Induced Emf in a circuit:Varying Magnetic Field (B)

  • Consider a coil, a magnet and a galvanometer.
  • As the magnet is brought near the coil,the magnetic field associated with the coil changes.
  • Mathematically,
    • Φ = BAcosθ if we change the strength of the magnetic field(B), the value of flux will change as a result emf is induced.


When the magnet is brought near the coil, magnetic field changes


When the magnet passes through the coil the is a deflection in the galvanometer


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