Posted by tina on Tuesday, February 5, 2008 at 3:14am.
The needle end that points north gets labelled N, but its polarity is really opposite.
When one defines a magnet's N-S polarity in terms of the direction of the field lines that emerge, the compass needle is correcly labelled, but one finds that the north magnetic pole of the Earth is actually a south magnetic pole, and vice versa.
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