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J. Perelman
"Entertaining physics". Book 2.
Chapter 8. The magnetism. Electricity

THE PROBLEM OF THE COMPASS

We used to think that the compass needle always facing one end to the North, the other South. We seem so absurd next question: where on the globe the magnetic needle points North at both ends?

And even more absurd will hear the question: where on the globe the magnetic needle at both ends shows South?

Are you prepared to argue that this places on our planet is not and cannot be. Yet they exist.

Recall that the magnetic poles of the Earth do not coincide with the geographic poles - and you probably can guess, about where our planet is in the task of speech. Where will show a compass needle placed at the geographic South pole? One end is directed toward the nearest magnetic pole, the other in the opposite. But what neither side would go from the geographic South pole, we will always be sent to the North; the other direction from the geographic South pole no, " around him throughout the North. Therefore, the magnetic needle placed there to show North at both ends.

Similarly, the compass needle moved to the North geographic pole, both ends must show to the South.

Entertaining physics J. Perelman

 




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