A rotating magnetic field is a magnetic field that changes direction over time, typically produced by alternating current (AC) in electrical systems. This phenomenon is essential in the operation of devices like electric motors and generators, where the magnetic field interacts with coils of wire to produce motion or electricity. In a rotating magnetic field, the magnetic poles appear to move in a circular path. This effect is achieved by using multiple coils arranged in a specific pattern, allowing the magnetic field to rotate smoothly. The concept is fundamental in the design of many modern technologies, including induction motors and transformers.