Question

Define the term self inductance of a coil write it's SI unit

Answer 1

hyy...Self induction is the property of a coil by virtue of which , the coil opposes any change in the strength of current flowing through it by inducing an e.m.f in itself. We know that Ф is directly proportional to current. Hence Ф = LI and e = -dФ/dt = -d/dt (LI) or e = -L * dI/dt. So we get L= -e/dI/dt. The S.I unit of L is Henry. Therefore Self inductance of a coil is said to be one Henry when a current change at the rate of 1 amp/sec through the coil induces an e.m.f of 1 volt in the coil. As 1 henry = 1volt/1amp/sec = 1volt-sec/ampere.
 
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Answer 2

Hey !!

Self inductance is the property by which an opposing induced emf is produced a change in current, or magnetic flux, linked with the coil.

                                            (OR)

Self-inductance of a coil is numerically equal to the flux linked with the coil when the current through the coil is 1 A.

                                            (OR)

Self-inductance of a coil is equal to the induced emf developed in the coil when the rate of change of current in the coil is one ampere per second.

S.I Unit of self-inductance is ''HENRY''

NOTE :- I have provided you with the 3 definitions of self-inductance you can choose any one of them.

GOOD LUCK !!