What is the physical significance of self-induction?

Explanation

### Step-by-Step Solution:

1. **Understanding Self-Induction**: Self-induction is a phenomenon that occurs in electrical circuits, particularly in coils or inductors. When the current flowing through a coil changes, it induces an electromotive force (EMF) in the same coil due to the changing magnetic field around it.

2. **Current Flow and Magnetic Flux**: When a coil is connected to a battery and the switch is closed, current begins to flow through the coil. This flow of current generates a magnetic field around the coil, leading to a change in magnetic flux.

3. **Lenz's Law**: According to Lenz's Law, the induced EMF will always act in a direction to oppose the change in magnetic flux that produced it. This means that if the current is increasing, the induced EMF will act to decrease the current, and if the current is decreasing, the induced EMF will act to increase the current.

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