Why did Maxwell introduce the concept of displacement current in his theory?

Explanation

### Step-by-Step Solution:

1. **Understanding Ampere's Law**:
- Ampere's Law states that the line integral of the magnetic field **B** around a closed loop is proportional to the electric current **I** passing through that loop. Mathematically, it is expressed as:
\[ \oint \mathbf{B} \cdot d\mathbf{l} = \mu_0 I \]
- This law implies that a magnetic field is generated by an electric current.
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