What part of an AC generator contains the electromagnetic field?

• A. Stator
• B. Rotor
• C. Commutator
• D. Windings

Answer: (B)

The rotor of an AC generator is the component that contains the electromagnetic field. In an AC generator, the rotor is typically a rotating part that can either be a permanent magnet or an electromagnet. It is responsible for producing a magnetic field that interacts with the stator, which houses the coils of wire. As the rotor spins, the magnetic field it generates induces an alternating current in the stator windings through electromagnetic induction.

This interaction is crucial for the generation of electricity in an AC generator. The magnetic field must cut across the windings in the stator to create voltage. Therefore, the effective functioning of the generator heavily relies on the rotor's ability to create a strong and stable magnetic field, making it integral to the overall operation of the AC generator.