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vsage
Oct17-04, 10:03 PM
This is a prelab question for a lab I'm supposed to do tomorrow but I feel like I'm so baffled at how simple the quesiton is that I'm afraid to put down an answer for fear of misunderstanding the question:

The earth's field appears as it were produced by a strong permanent magnet embedded in its core and aligned in the north-south direction. But which end is which? Which way do you think the north end of the earth's permanent magnet points? Why?

From what I understand the north pole of earth's magnetic field is only a few hundred miles away from the physical north and the south pole is only a few hundred miles away from the physical south. Which "way" the magnet points would be toward the physical south if I understand the correctly. As to "why" I can't even venture a guess because it's my understanding that the earth has switched polarity plenty of times so I can't really give a definitive answer. Could someone offer a more clear explanation to this? I'd appreciate it.

Janitor
Oct17-04, 10:40 PM
Look at the paragraph near the bottom of http://www.tpub.com/neets/book1/chapter1/1g.htm which starts out, "The fact that a..."

They probably don't want you to be worrying too much about past polarity flips of the Earth's field.

vsage
Oct17-04, 10:56 PM
Thanks for clearing that up. I knew the question had to be counterintuitive just by the fact that it was a lab question.