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Electromagnetic Induction

Magnetic flux linked with a surface:

  • It is ​the number of magnetic lines of force crossing a surface.

  • Flux linked with a surface of area A placed in a magnetic field B, capital phi equals B with rightwards arrow on top. A with rightwards arrow on top equals space B A space cos space theta.

  • SI unit of flux is Weber.

​Faraday's Laws

  • First Law − Whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in the circuit. The induced emf lasts as long as the change in magnetic flux continues.

  • Second Law − The magnitude of emf induced in a circuit is directly proportional to the rate of change of magnetic flux linked with the circuit.
    The emf induced in a coil for changing magnetic flux(ϕB) linked with it is given by e equals negative N fraction numerator d capital phi subscript B over denominator d t end fraction.

Fleming's Right Hand Rule

The thumb, the first finger and the middle finger of the right hand are stretched such that they are mutually perpendicular to each other. If the first finger is along the direction of the magnetic field and the thumb is along the direction of the motion of the conductor, then the middle finger …

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