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Question
What do you understand by self-inductance of a coil?
Solution
Self-inductance or simply inductance of a coil is defined as the flux linkage of the coil when 1A current flows through it.
When the current i changes with time, an emf is induced in it. From Faraday’s law of electromagnetic induction, this self-induced emf is given by
`epsilon = - ("d"("N"Φ_"B"))/"dt" = ("d" ("Li"))/"dt"`
`therefore epsilon = - "L""di"/"dt"` or L = `(-epsilon)/("di"//"dt")`
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