Possibility of getting electrical energy from the rotation of the Earth through its own magnetic field.
The homopolar generator has a conducting disc rotating along with an axially mounted cylinder magnet; the disc is cemented near the pole of the magnet. Rotating through the magnetic field, a potential difference is between the center of the disc and its rim. Brushes pick up voltage here. The Earth is doing essentially the same thing; it rotates through its own magnetic field. The Earth?s oceans near the poles are conductors, moving through the Earth's magnetic field, containing positive and negative salt water ions. There should be a separation of charge in the ocean, near the poles. There could be a potential difference between the ocean water near the poles and any grounded wire on land at the same lattitude. Cables could be used connecting these two places and you could get a constant supply of direct current, provided by the Earth?s rotation through its own magnetic field. The ions in the sea water near the end of the cable should be constantly replenished providing a constant voltage. Near the poles, the magnetic field should be stronger as it is with a magnet. Also, the cable near the poles would be cold, causing the electrical resistance in the cable to decrease. [Because the cable is parallel to the lattitude, there should be no back emf to cancel out the effect.] Near the poles the field lines are coming up out of the Earth. [Emf is generated perpendicular to the motion through the field and perpendicular to the field lines. The separation of charge moves in this direction.]
In this case it would not be a closed circuit. It would be like picking up volage from the different terminals of a battery. Just like the charge is separated in the rotating disk at the pole of the magnet, the salt water aound the polar region, rotating through polar field lines (going upward) would cause a separation in positive and negative ions of sodium and chlorine; the separation would be close to the ice cap and the other charge pushed away from it southward. This should cause an electrical potential difference in these two regions of water. Running a cable from the seawater near the pole, to a ground wire on land at the same lattitude, should produce electrical current, if the potential in that water and the potential in the ground wire is different enough. Emf is produced perpendicular to the field lines and the motion through the field. The only emf produced in a cable, by it moving through the field, that is running parallel to lattitude would be from one side of the cable to the other side; IT WOULD NOT BE ALONG THE LENGTH OF THE CABLE. So, there should be no back current to interfere with the current between the sea water and the ground line. The electrical potential in the sea water would continually be re supplied by more ions as the sea water rotated through the magnetic field of the Earth. Magnetic field is probably stronger near the poles and the cold temperature would reduce resistence in the cable. I think it should be investigated to see if there is a potential difference between sea water near the north pole and a ground wire on land at the same lattitude. What I described to you is picking up voltage between two points, like it is with a car battery. This is not a coil, like you have in an induction generator. That is why I am using the h*mo-polar generator as the model, to try to get electricity from the motion of the Earth through its own magnetic field. See telluric currents. There are natural earth currents called telluric currents, and these might also be caused by the Earth rotating through its own field. - this is also another line of investigation, to find a source of electricity from the Earth's rotation.
Any direct current obtained from the Earth's rotation could be used to turn a direct current motor attached to an alternating current generator, to produce AC current. The AC can be fed into a city's power lines.
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