例文
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- The north pole of a bar magnet in a compass points north.
- Flipping a bar magnet is equivalent to rotating its by 180 degrees.
- He also develops his hypothesis that a bar magnet has additional poles, East-West poles.
- Early EMG pickup designs were made with a bar magnet inside for two reasons.
- Imagine a bar magnet moving towards a coil, with north pole nearer to the coil.