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Answer: c
Explanation: The range of the pole length to pole pitch ratio should be between 1.0-1.25 for the good power factor. The range of the pole length to pole pitch ratio should be between 1.5-2 for minimum cost.
The range of the pole length to pole pitch ratio for obtaining a good power factor in induction motors generally lies between 0.4 and 0.7. A ratio in this range helps in minimizing losses and improving the power factor suitable for efficient operation.