# Right Hand Rule

15 degrees below the vertical?

haruspex
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No, it's not right, according to the answer key: answer says 15 degrees above horizontal in the north south plane

haruspex
Homework Helper
Gold Member
2018 Award
No, it's not right, according to the answer key: answer says 15 degrees above horizontal in the north south plane
Ah yes, I slipped up.
The direction of Earth's magnetic field is towards the North. That's the way the North pole of a magnetic compass points. This means that considering the Earth as a magnet, its North pole is in the geographic South. Confusing isn't it?

It's 75 degrees below horizontal, so why is it north instead of south?

haruspex
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2018 Award
It's 75 degrees below horizontal, so why is it north instead of south?
It doesn't depend on the dip angle.
The direction of the magnetic field of a dipole is defined, by convention, to be out of its North pole into its South pole.
The North pole of a magnet is defined to be the end which is attracted to somewhere near Earth's geographic North.
But the North pole of one magnet is attracted to the South pole of another. It follows that regarding Earth as a magnet, its North pole is at its geographic South pole, and vice versa.
To put it another way, the North pole of a compass needle points in the local direction of the Earth's magnetic field, i.e., approximately geographic North.
(In the context of the question, the 75 degree dip means we're at a high northern latitude.)