What is 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

$ \large d\phi_B = \vec{B}.\vec{ds} $

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

Here $\vec{B}$ is the magnetic field and $\vec{ds}$ is area element. Area is taken as a vector quantity and its direction is perpendicular to surface

Magnetic Flux associated with plane coil having N turns in a uniform magnetic field $\vec{B}$  is equal to

$ \large \phi_B = N ( \vec{B}.\vec{A} ) $

$ \large \phi_B = N B A cos\theta $

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.

Also Read :

→Faraday’s Law of Electromagnetic Induction
→ Lenz’s Law
→ Motional e.m.f
→ Self Induction
→ Mutual Induction
→ R – L Circuit : Growth & Decay of Current
→ Energy stored in an Inductor
→ L.C oscillations
→ Solved Examples : L.C. oscillations
→ Time Varying Magnetic Field

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