Out of the following options which one can be used to produce a propagating electromagnetic wave?

Options

A. A charge moving at constant velocity
B. A stationary charge
C. A chargeless particle
D. An accelerating charge

Explanation

To determine which option can be used to produce a propagating electromagnetic wave, we need to analyze each option based on the principles of electromagnetism.

### Step-by-Step Solution:

1. **Understand the Requirements for Electromagnetic Waves**:
- Electromagnetic waves require both an electric field (E) and a magnetic field (B) that vary with time and space. A changing electric field produces a magnetic field, and a changing magnetic field produces an electric field.

2. **Evaluate the First Option: Charge Moving with Constant Velocity**:
- A charge moving with constant velocity produces a steady current. While it generates a magnetic field, this field does not change over time (it is constant). Therefore, there is no changing electric field produced, which means no electromagnetic wave is generated.

3. **Evaluate the Second Option: Stationary Charge**:
- A stationary charge creates a static electric field around it. However, since the charge is not moving, there is no changing magnetic field. Thus, there is no electromagnetic wave produced in this case either.

4. **Evaluate the Third Option: Chargeless Particle**:
- A chargeless particle does not generate any electric or magnetic fields. Since there are no fields present, it cannot produce an electromagnetic wave.

5. **Evaluate the Fourth Option: Accelerating Charge**:
- An accelerating charge creates both a changing electric field and a changing magnetic field. This is the key condition for generating electromagnetic waves. The acceleration of the charge leads to variations in both fields, allowing for the propagation of electromagnetic waves.

6. **Conclusion**:
- The only option that can produce a propagating electromagnetic wave is an **Accelerating Charge**.

### Final Answer:
**An Accelerating Charge**