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For machines with a small number of poles, concentrated coils or windings are typically used. Concentrated coils consist of windings that are grouped together around each pole. This type of coil configuration contrasts with distributed windings, where the coils are spread out across several poles. Concentrated windings are simpler to manufacture and are effective in machines where the primary goal is to minimize the number of poles while achieving effective electromagnetic induction, such as in certain types of motors and generators designed for specific applications.
Answer: b
Explanation: Different type of coils are being made use of for the machines as per the quantity of number of poles. For small number of poles the wire wound coils are made use of.