State the working of a.c. generator with the help of a labelled diagram. The coil of an a.c. generator having N turns, each of area A, is rotated with a constant angular velocity `omega`. Deduce the expression for the alternating e.m.f. generated in the coil. What is the source of energy generation in this device?

Explanation

### Step-by-Step Solution for the Working of an AC Generator

#### Step 1: Understanding the AC Generator
An AC (Alternating Current) generator, also known as an alternator, converts mechanical energy into electrical energy. It consists of a coil of wire (armature) that rotates in a magnetic field.

#### Step 2: Labelled Diagram
Draw a labelled diagram of an AC generator:
- **Field Magnets (N and S)**: These create a strong magnetic field.
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