是一个次极线圈，由相当大的尺寸和较小的长度构成，环绕与线圈a接近。
C is a second coil formed by a conductor of much larger size and smaller length, wound around and in proximity to coil a.
是一个次极线圈，由相当大的尺寸和较小的长度构成，环绕与线圈a接近。
C is a second coil formed by a conductor of much larger size and smaller length, wound around and in proximity to coil a.
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