Dear All, We know that in a transformer there is a bunch of flux (due to primary winding) that is not mutually coupled with the secondary winding. But how it is possible that there is a leakage flux (due to secondary winding) that is not mutually coupled with the primary winding, because secondary winding is not the cause of flux. Can you please suggest me that why textbooks are referring to a leakage flux due to secondary winding, because according to my concept that every flux line passing through the secondary must also pass through primary (from where it is originating)