An average emf of 20 V is induced in an inductor when the current in it is changed from `2.5 A` in one direction to the same valute in the opposite direction in 0.1 s. Find the self inductance of the inductor.

Explanation

To solve the problem, we need to find the self-inductance (L) of the inductor using the formula for induced electromotive force (emf) in an inductor:

\[ \text{emf} = -L \frac{di}{dt} \]

### Step-by-Step Solution:

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