# Inductance

### Explanation of question 1

An inductor has a self-inductance of 1H when

1. a current of 1A through the inductor produces a p.d. of 1V across its terminals
2. a current of 1A through the inductor produces a p.d. of 1V across another inductor
3. a rate of change of current of 1A/s in the inductor induces in it an e.m.f. of 1V
4. a rate of change of current of 1A/s in the inductor induces in another inductor an e.m.f. of 1V

The answer is :- 3 The definition of self inductance contains no reference to any additional inductor; self inductance is based upon a definition of a rate of change of current.

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