Self-Inductance

If the self-inductance of a magnetic system is L henrys and the current changes from l ₁ at time t₁ to l ₂ at time t₂, the induced e.m.f. is e = L × rate   of   change   of   current   = L × l 2 − l 1 t 2 − t 1   volts https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315871035/493355ff-3d84-454c-806b-bd269d794ee5/content/equ167.tif"/>