AC generator works on which of the following principle ?

Options

A. Electromagnetic Induction
B. Electromagnetic radiation
C. Bohr's Magneton Concept
D. Fleming's Rule

Explanation

**Step-by-Step Solution:**

1. **Understanding the AC Generator**: An AC generator, also known as an alternator, is a device that converts mechanical energy into electrical energy in the form of alternating current (AC).

2. **Identifying the Principle**: To determine the principle on which an AC generator operates, we need to look at the fundamental concepts of electromagnetism.

3. **Reviewing the Options**: The options provided are:
- Electromagnetic induction
- Electromagnetic radiation
- Bohr's magneton concept
- Fleming's rule

4. **Analyzing Each Option**:
- **Electromagnetic Induction**: This is the process by which a changing magnetic field within a coil of wire induces an electromotive force (EMF) in the wire. This is the principle that governs the operation of AC generators.
- **Electromagnetic Radiation**: This refers to the waves of the electromagnetic field propagating through space, which is not directly related to the operation of AC generators.
- **Bohr's Magneton Concept**: This concept relates to atomic physics and the magnetic moment of electrons, which is not applicable to the functioning of AC generators.
- **Fleming's Rule**: This refers to the rules used to determine the direction of current and magnetic fields, but it does not describe the principle of operation of an AC generator.

5. **Conclusion**: Based on the analysis, the AC generator operates on the principle of electromagnetic induction, specifically governed by Faraday's law of electromagnetic induction. Therefore, the correct answer is:
- **Electromagnetic Induction** (Option 1).