The aluminum rotor of an AC induction motor has no electrical connections and is not a permanent magnet. Nonetheless, it becomes magnetic during the motor's operation and is dragged around in a circle by the magnetic field around it. The rotor becomes magnetic because it is
A)	exposed to a changing/moving magnetic field that causes currents to flow in it.
B)	subject to vibrations which create an electrical dipole in it and give it a magnetic polarization.
C)	made of aluminum, an intrinsically magnetic metal. When you bring a magnet up to a piece of aluminum, the aluminum develops a north and south pole and is attracted to the magnet.
D)	full of magnetic north poles that migrate to the surface when the rotor is spinning.
Answer:A
The aluminum rotor of an AC induction motor has no electrical connections and is not a permanent magnet. Nonetheless, it becomes magnetic during the motor's operation and is dragged around in a circle by the magnetic field around it. The rotor becomes magnetic because it is
A)	exposed to a changing/moving magnetic field that causes currents to flow in it. B)	subject to vibrations which create an electrical dipole in it and give it a magnetic polarization. C)	made of aluminum, an intrinsically magnetic metal. When you bring a magnet up to a piece of aluminum, the aluminum develops a north and south pole and is attracted to the magnet. D)	full of magnetic north poles that migrate to the surface when the rotor is spinning.