串联谐振电磁感应加热 线圈L的大小对加热功率的影响
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加热功率减小了，原因为：L增加了，感抗也增加了（频率F与电感量L的增加量成开平方的反比，例L加大到4倍，F为0.5倍，感抗加大到2倍）通过线圈电流减小了，当然加热功率会减小（但不会减小到0.5倍）。磁通不会增加的，因为电流会减小。
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