The crucial quantity in induction is magnetic flux Φ , defined to be Φ = BA cos θ , where B is the magnetic field strength over an area A at an angle θ with the perpendicular to the area Any change in magnetic flux Φ induces an emf—the process is defined to be electromagnetic induction

Faraday’s law of induction states that the emfinduced by a change in magnetic flux is emf = - N Δ Φ Δ t when flux changes by Δ Φ in a time Δ t The minus sign means that the emf creates a current I and magnetic field B that oppose the change in flux Δ Φ —this opposition is known as Lenz’s law

induction — (magnetic induction) the creation of emfs and hence currents by magnetic fields. electromagnetic induction — the process of inducing an emf (voltage) with a change in magnetic flux. magnetic flux — the amount of magnetic field going through a particular area, calculated with Φ = BA cos θ where B is the magnetic field strength over an area A at an angle θ with the…. crucial quantity in induction — magnetic flux Φ , defined to be Φ = BA cos θ , where B is the magnetic field strength over an area A at an angle θ with the perpendicular to the area.