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When using magnets, How does a compass determine the quantitative value of the magnitude and the direction of the magnetic field?

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  • $\begingroup$ It doesn't determine the magnitude, only the projection of the direction in one plane. $\endgroup$ – ahemmetter Dec 12 '18 at 11:36
  • $\begingroup$ Is there a device that can determine the magnitude? $\endgroup$ – Raine Gonzales Dec 12 '18 at 11:40
  • $\begingroup$ Sure, there are many, working on all kinds of different physical principles. Probably the most common are Hall sensors. $\endgroup$ – ahemmetter Dec 12 '18 at 11:44
  • $\begingroup$ Is it still applicable when the earths poles aren't used but another magnetic field?? $\endgroup$ – Raine Gonzales Dec 12 '18 at 11:58
  • $\begingroup$ Sure, a magnetic field is a magnetic field, no matter what the origin is. However, some magnetometers are better suited for certain applications/situations/field strengths. $\endgroup$ – ahemmetter Dec 12 '18 at 12:17
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The earth has the North Pole and the South Pole, they have magnetic fields which flow from North to South. A compass needle tracks onto these magnetic fields, and therefore pointing Noth (the Geographical North Pole is actually South facing).

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