There are mainly two hypotheses on it, one is the M hypothesis which assumes that the force lines co-rotate with the magnet, and the other is the N hypothesis which as.
两种主要观点是：M理论认为磁场随着磁体一起转动；N理论认为磁场不随磁体一起转动。
The pole configuration at the S-pole side is arranged so that S-side magnet poles are coaxial to N-side core poles, and vice versa.
S极边的极配置是这样安排的，即S 极边的磁极与N 极边的铁极同轴，反之亦然。
The pole configuration at the S-pole side is arranged so that S-side magnet poles are coaxial to N-side core poles, and vice versa.
S极边的极配置是这样安排的，即S 极边的磁极与N 极边的铁极同轴，反之亦然。
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