What is the physical role of self inductance?

Explanation

### Step-by-Step Solution:

1. **Definition of Self-Inductance**:
Self-inductance, denoted by the symbol \( L \), is a property of a coil or circuit that quantifies its ability to induce an electromotive force (EMF) in itself due to a change in current.

2. **Analogy with Mass**:
In mechanics, mass is a measure of an object's inertia, which is its resistance to changes in motion. Similarly, self-inductance can be thought of as the electrical equivalent of mass. The greater the self-inductance, the greater the electrical inertia.

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