Final answer:
The induction motor part located outside the enclosure and composed of series electromagnets is the stator. It facilitates the induction process in motors, where the rotating coil inside the magnetic field induces an electromotive force (back emf) that opposes the input emf according to Lenz's law.
Step-by-step explanation:
The part of an induction motor that is located outside the glass or metal enclosure and consists of a series of electromagnets equally spaced around the neck of the tube is referred to as the stator. The stator is an essential component as it creates a rotating magnetic field that causes the rotor (inside the enclosure) to spin, following the principle of electromagnetic induction.
Induction motors operate based on the principle of induced emf, also known as back emf. This occurs when a conductive coil, such as the windings on the rotor, rotates within a magnetic field. According to Faraday's Law, any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be "induced" in the coil. Notably, Lenz's law states that the direction of this induced emf will always be such that it opposes the change that produced it. Hence, back emf works against the emf input to the motor, playing a crucial role in motor efficiency and operation.