In describing Faraday’s law, we mentioned that the emf produced by a changing flux is called a transformer action emf. The
reason for this name is to distinguish it from the motional emf discussed in the previous section and because it is commonly
encountered in transformers. The distinction here is between a moving conductor in the field causing a change in flux
(motional emf) and a stationary loop in a changing magnetic field (transformer action emf). If the emf is connected in a
closed circuit, there will also be a current in the loop and this current will produce a flux density according to Lenz’s law.