What is the source of energy associated with propagating em waves?

Explanation

To answer the question "What is the source of energy associated with propagating electromagnetic (EM) waves?", we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Understanding Electromagnetic Waves**:
- Electromagnetic waves are waves that propagate through space and consist of oscillating electric and magnetic fields that are perpendicular to each other and to the direction of wave propagation.

2. **Role of Charged Particles**:
...