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Electromagnetic Induction and Alternating Current

Electromagnetic Induction and Alternating Current Notes for Class 11 - 12

Electromagnetic Induction

The process of inducing temporary electromotive force or electricity by means of a moving magnet or current conducting coil in a closed circuit is called electromagnetic induction.

Magnetic flux

Product of area of a surface and perpendicular component of magnetic field in the surface is called magnetic flux.

Magnetic flux density

The magnetic flux density refers to the flux per unit area.

Self-induction

A magnetic flux associated with a coil changes due to change in electric flow through the coil or due to change in motion of the coil. The electromagnetic induction taking place due to change is called self-induction.

Co-efficient of self-induction

If one unit of current flows in a coil, total amount of magnetic flux associated with the coil is called co-efficient of self-induction.

Mutual induction

The phenomenon of electromagnetic induction produced in secondary coil due to the non-uniform flow of current in the primary coil is called mutual induction.

Co-efficient of mutual induction

The number of magnetic flux associated with secondary coil due to flow of one unit of current in the primary coil is called mutual induction.

Alternating current

In a current, if current flow changes its direction after a certain period and gains its maximum and minimum values after a certain time interval, this current flow is called alternating current.

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