Questions tagged [geomagnetism]

Geomagnetism covers questions related to the Earth’s magnetic field, its origin, history and measurement. Use electromagnetism for more general questions on magnetism.

19 questions with no upvoted or accepted answers
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Can Earth's Magnetic Field Be as Less as -85μT and as Much as +70.46μT?

What did create the question? I was analyzing a data set where the researchers have used objective data. They have calculated earth's magnetic field through sensors and that research was conducted in ...
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3answers
192 views

Could a magnetic field with a direction opposite the earths be repelled?

Could a magnetic field with a direction opposite the earths repel the earth, or would it have to be of equal force?
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Aurora borealis forecasting, some technical details

I have an idea to make a software tool (with some really user friendly interface) for predicting auroras on any place on Earth. I do know some physics behind the phenomenon, but only basics, like it ...
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328 views

Quantum Locking Superconductors on Earth's Magnetic Field

Is the earth's magnetic field strong enough to hold a quantum locked superconductor, or the superconductor wouldn't be able hold its own weight? How strong should be the earth's magnetic field to ...
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1answer
32 views

Does the Earth's magnetic field reversal and the corresponding magnetostrictive stress and strain make any contribution to the Earth's oblateness?

If the changing magnetic field in a power grid's transformer can induce stress and strain on the transformer core, then can the changing magnetic field of the Earth, similarly, place stresses and ...
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1answer
80 views

How does a compass work?

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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148 views

Regarding the $E × B$ drift in the Earth's magnetic field

So I have a burning question: The only reason that the E x B drift doesn't generate an electric current is because both the electrons and the positive ions move towards the same direction (towards ...
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48 views

Interaction of geomagnetism on free falling coil

Take the Earth, or a similarly large body with an Electromagnetic field. For now - expect atmosphere. Then take a much smaller object - say the size of bus, containing a coil with many windings. If ...
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27 views

Earth's magnetic field lines with magnetic compass needle

Will the compass needle deflect in the opposite side inside the earth? If so, where will be that location inside the earth?
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26 views

Will a neodymium magnet levitate on ice at Earth's North and South Pole?

Will a neodymium magnet levitate on ice at NP or SP? Asking just because these magnets are powerful and the Earth magnetism is fairly stronger at poles than at the Equator.
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1answer
33 views

Ferromagnetic field near a ring in Earth's magnetic field

Let's say I am trying to find out the effect that an iron ring has on the Earth's magnetic field (approximated to a uniform field at infinity). Can I solve it in 4 steps: Find the magnetic field due ...
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1answer
53 views

What will pole reversal cause to modern world and civilization?

I don't think it's just a matter of reorienting maps and recalibrating compasses. In any case, how long does a inversion last? hours, days, weeks, years? If it lasts days or more.... would Sun fry ...
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Magnet size vs field strength

Why is a compass not significantly affected by nearby (less than a couple meters) powerful magnets (such as those located inside home appliances and electronics) given Earth's magnetic field is just ...
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36 views

Why does a steel bar buried inside earth exhibits magnetic property? What will be the effect on it if we put it on the surface of the earth?

I'm thinking that it is because the magnetic field inside the earth is stronger than it is on the surface. Please correct me if I am wrong and give detailed solution. Thanks!
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70 views

What is the origin of the ring current in the Earth's magnetosphere?

Is ring current caused by gradient-curvature drift? I can't find a website that explicitly says that, they just call it 'longitudinal drift' and don't specify the mechanism, which I assume is ...
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86 views

Could we pump up (or deplete) the Earth's magnetic field?

This text calculates the energy in the Earth's field as about 10^17 Joules, and adds: A typical power station is a giga watt, and the number of seconds in a year is about 3 × 10^7 so a power ...
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Will this system of magnets rotate?

A system of four magnets are placed as shown in the figure. As per the application of Maglev, a stationary magnet produces electro motive force with the magnets in motion. Note That the point O is ...
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371 views

What happens if Earth loses its magnetic field?

Earth's magnetic field is shifting at a high speed does this mean earth will lose its magnetic field and if it does are we in danger or if it doesn't what are consequences of the poles shifting
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622 views

What is the pull force of Earth's magnetic field per square metre on one of the magnetic poles?

I was wondering if anyone knows what is the strength of pull of Earth's magnetic field near magnetic poles. I found that the field strength is approximately 0.65 gauss, but was unable to convert this ...