Electromagnetic waves are produced by

Options

A. a static charge
B. a moving charge
C. an accelerating charge
D. chargeless particles.

Answer

To solve the question "Electromagnetic waves are produced by," we will analyze each of the given options step by step.

### Step 1: Understand the nature of electric and magnetic fields produced by charges
- A static charge produces only an electric field. It does not create any changing magnetic field, hence no electromagnetic waves are generated.

**Hint:** Remember that static charges are stationary and only create electric fields.

### Step 2: Consider the effect of a moving charge
- A moving charge generates both an electric field and a magnetic field. However, this does not necessarily lead to the production of electromagnetic waves. The fields are static in nature relative to the moving charge.

**Hint:** Think about how motion affects the fields but does not create waves unless there is acceleration.

### Step 3: Analyze the case of an accelerating charge
- An accelerating charge produces both electric and magnetic fields that change with time. This changing nature of the fields is what leads to the generation of electromagnetic waves. According to Maxwell's equations, an accelerating charge can emit electromagnetic radiation.

**Hint:** Focus on the relationship between acceleration and the generation of waves.

### Step 4: Evaluate the option of chargeless particles
- Chargeless particles, by definition, do not have an electric charge and therefore cannot produce electric or magnetic fields. Thus, they cannot generate electromagnetic waves.

**Hint:** Consider the implications of having no charge at all.

### Conclusion
Based on the analysis of the options, we conclude that electromagnetic waves are produced by an accelerating charge. Therefore, the correct answer is:

**Electromagnetic waves are produced by an accelerating charge.**

### Final Answer
**Electromagnetic waves are produced by an accelerating charge.**