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Machines that have a large number of poles per phase are typically synchronous machines, especially those designed for low-speed applications, such as hydroelectric generators or some types of wind turbines. These machines can have dozen of poles to match the low rotational speed of the turbines with the frequency of the electrical grid. The large number of poles allows these generators to produce electricity at the standard grid frequency (50 or 60 Hz, depending on the country) without needing to rotate at high speeds.
Answer: b
Explanation: The high voltage machines have a large number of poles per phase. The small value of flux per pole per phase also results in large number of poles per phase.