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The main advantage of a winding with multi-turns coils, as used in electrical machines and transformers, is its ability to produce a stronger magnetic field for a given current, or conversely, to produce a required magnetic field strength with a lower current. This is because the magnetic field strength is proportional to the number of turns in the coil multiplied by the current flowing through it (as expressed by Ampère’s law). By increasing the number of turns, a more powerful magnetic field can be achieved without needing to increase the current, which can lead to more efficient operation and reduced electrical losses. Additionally, using multi-turn coils allows for better control over the inductance and electromotive force (EMF) of the winding, enabling precise design and performance characteristics tailored to specific applications.
Answer: b
Explanation: The main advantage of a winding with multi-turns coils is that it allows a greater flexibility in selecting the value of stator slots. It in turn helps in choosing the required number of turns per phase.