The Faraday's law of induction The magnitude of emf induced in the circuit is equal to the rate at which the magnetic flux through the circuit changes with time. dΦ dt dΦ If the coil has N turns: =-WThe Faraday’s law of induction The magnitude of emf induced in the circuit is equal to the rate at which the magnetic flux through the circuit changes with time. dt d    If the coil has N turns: dt d N    