The correct answer is: B. a single turn of heavy copper wire which is short-circuited and carries only induced current.
A shaded pole motor is a type of single-phase induction motor that uses a shading coil to create a rotating magnetic field. The shading coil is a short-circuited turn of copper wire that is placed around one of the poles of the stator. When the motor is turned on, the current in the stator winding creates a magnetic field. This magnetic field induces a current in the shading coil. The current in the shading coil creates its own magnetic field, which opposes the magnetic field of the stator winding. This opposition creates a rotating magnetic field, which causes the rotor to turn.
The shading coil is usually made of a single turn of heavy copper wire. This is because the shading coil needs to carry a large amount of current in order to create a strong magnetic field. The shading coil is also short-circuited so that the current in the coil cannot flow back to the stator winding. This prevents the current in the shading coil from interfering with the current in the stator winding.
The other options are incorrect because:
- Option A is incorrect because the shading coil is not in parallel with the running winding. The shading coil is short-circuited, which means that it is not connected to the running winding.
- Option C is incorrect because the shading coil is not made of a multilayer fine gauge copper wire. The shading coil is made of a single turn of heavy copper wire.
- Option D is incorrect because the shading coil is not a none of the above. The shading coil is a single turn of heavy copper wire that is short-circuited and carries only induced current.