This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...found to have a negative charge, exactly as when the finger was touched at a. We conclude, therefore, that no matter where the body B is touched, the sign of the charge left upon it is always opposite to that of the inducing charge. This is because the negative electricity can under no circumstances escape from B so ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...found to have a negative charge, exactly as when the finger was touched at a. We conclude, therefore, that no matter where the body B is touched, the sign of the charge left upon it is always opposite to that of the inducing charge. This is because the negative electricity can under no circumstances escape from B so long as C is present, for it is "bound" by the attraction of the positive charge on C. We may think of the final negative charge on B as due either to the fact that the positive escapes through the finger, or that enough more negative is drawn up to B to counteract this positive which was at a. 332. Charging the electroscope by induction. Let an ebonite rod which has been rubbed with cat's skin be brought near the knob of the electroscope (Fig. 235). The leaves at once diverge. Let the knob be touched with the finger while the rod is held in place. The leaves will fall together. Let the finger be removed and then the rod. The leaves will fly apart again. The electroscope has been charged by induction, and since the charge on the ebonite rod was negative, the charge on the electroscope must be positive. If this conclusion is tested by bringing the ebonite rod near the electroscope, the leaves will fall together as the rod approaches the knob. How does this prove that the charge on the electroscope is positive? fig 239 plus and 333. Plus and minus electricities always TMnus electricities always developed appear simultaneously and in equal amounts. in equal amounts Let an ebonite rod be completely discharged by passing it quickly through a Bunsen flame. Let a flannel cap having a silk thread attached be slipped over the rod, as in Fig. 239, and twisted rapidly around a number of times. When rod and cap together are held near a charged ele...
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