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 associated with any area is given by the expression

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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