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The Reversal of Hall's Phenomenon

Nature volume 29, page 514 | Download Citation



IN a recent communication to the Physical Society I mentioned among other things that I had succeeded in reversing the direction of the Hall effect in iron. It as, however, found to be so exceedingly difficult to keep the two points where the galvanometer connections were made at the tame potential, even for a few seconds, that the extent of the deflections due to the Hall effect could only be roughly guessed at, and the experiment was hardly a satisfactory one. I believe this inconvenience arose from the fact that the iron, being a strongly magnetic metal, was slightly displaced whenever the polarity of the electromagnet was reversed, thus shifting the points of contact with the galvanometer wires. I have since repeated the experiment with gold, which turns out to be perfectly easy to work with, and altogether more suitable for the purpose. The following is an account of four experiments:—

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