Final answer:
The correct option : C inductively.
The rotor of an AC induction motor is inductively charged by a rotating magnetic field from the stator, which induces an electric current into the rotor causing it to turn.
Step-by-step explanation:
The rotor of an AC induction motor receives current inductively. Unlike DC motors that use brushes and commutators to transfer current to the rotating armature, AC induction motors operate on a different principle. In an induction motor, the rotating magnetic field produced by the stator induces an electric current into the rotor. This is due to the relative motion between the rotor and the stator's rotating magnetic field. The induced current in the rotor creates its own magnetic field which interacts with the stator's field, producing torque and causing the rotor to turn.
Wind turbines are a practical example where induction is utilized. As wind pushes the blades of the turbine, a shaft attached to magnets spins, inducing electric current in a surrounding conductive coil, which can then feed the electrical grid. This process converts kinetic energy into electrical energy without requiring brushes or direct electrical contacts.