Electromagnetic Induction

Electromagnetic Induction: Whenever the magnetic flux linked with a coil (or a closed circuit) changes with time, an emf and a current are induced in the circuit. This phenomenon first observed by Faraday is called electromagnetic induction.

Magnetic flux : Magnetic flux associated with any area is given by the expression

$\displaystyle \phi_B = \int \vec{B}.\vec{ds}$

Here Bis the magnetic field and ds is area element. Area is taken as a vector quantity and its direction is perpendicular to surface

Flux associated with plane coil having N turns in a uniform magnetic field B is equal to

=> N( B. A)

=> φB = NBA cosθ

Here N is the number of turns in the loop

B = magnetic field strength

A = area of the loop

θ = angle between area vector and magnetic field.

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