Final answer:
The correct statement about motor operation is that the rotor mechanically rotates due to magnetic torque, and the stator remains stationary. An electric motor converts electrical energy into mechanical energy, contrasting with a generator which does the opposite.
Step-by-step explanation:
In electric motors and generators, it's important to understand the movement of the rotor and stator. The correct statement regarding their operation is that the rotor mechanically rotates due to the exertion of torque by the magnetic field when current is passed through its loops. This conversion of electrical energy into mechanical work is fundamental in motor operation. Conversely, the stator, which is stationary, does not rotate mechanically or electrically. Instead, it provides a constant magnetic field that interacts with the rotor.
In generators, the process is reversed. When the loop or coil of a generator is mechanically turned, magnetic flux changes and an electromotive force (emf) is induced, transforming mechanical energy into electrical energy, as per Faraday's law of induction. Thus, an electric motor transforms electrical energy into mechanical energy, whereas a generator converts mechanical energy into electrical energy.