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CHAPTER 1 Electric Charge and Electric Field
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means of dry silk strings. The dry strings are insulators which will prevent the charges from leaking o the rods, and yet will allow the rods to swing freely. We now observe the three experimental results shown in Fig. 2.
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Since both glass rods were charged by the same means (rubbing with silk cloth), it follows that both glass rods carry the same type of charge. Likewise, since both rubber rods were charged by the same means (rubbing with cat s fur), it follows that both rubber rods carry the same type of charge. It follows, then, that if a glass rod carried the same kind of charge as a rubber rod, then a glass rod and a rubber rod would repel each other, but experiment C shows they attract each other. Therefore the type of charge on the glass rod must be di erent from the type of charge on the rubber rod. So far, then, experiments A, B, and C show there are at least TWO di erent kinds of electric charge. The kind appearing on the glass rod is called POSITIVE electric charge, and the kind appearing on the rubber rod is called NEGATIVE electric charge. Now consider the following. As mentioned before, all substances can be charged by friction to a greater or less degree. Let us charge, by identical means, two rods both made of the same substance x, which can be any material we wish to test. Since both rods are made of the same material, and both are charged by the same means, it follows that both rods will carry the same kind of charge. Experiment then shows that any two such rods that carry the same kind of charge will always REPEL each other. Such experiments establish the general rule that LIKE CHARGES ALWAYS REPEL EACH OTHER. We next make a series of experiments to see what reaction there is between a charged rod of any material x and charged rods of glass and hard rubber. Here is what we nd. 1. If a charged rod of any substance x repels a charged rod of glass, it will attract a charged rod of rubber; hence in this case the rod of substance x carries the same kind of charge as the glass rod, which is positive charge. If, on the other hand, a charged rod of any substance x attracts a charged rod of glass, it will repel a charged rod of rubber; hence in this case the rod of substance x carries the same kind of charge as the rubber rod, which is negative charge.
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CHAPTER 1 Electric Charge and Electric Field
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Hence we can now summarize that As far as we can determine by experiment there are TWO KINDS of electric charge. For reference purposes, the type that appears on a glass rod rubbed with silk cloth is POSITIVE charge, and the type that appears on a hard rubber rod rubbed with cat s fur is NEGATIVE charge. Experiment veri es the general rule that LIKE CHARGES REPEL EACH OTHER and UNLIKE CHARGES ATTRACT EACH OTHER. It should be pointed out that an electrically neutral body contains EQUAL AMOUNTS of positive and negative charges. If, however, some of the negative charge is removed from the body, then that body is left with more positive charge than negative charge, and therefore becomes a positively charged body. Or, if some of the positive charge is removed from a body, the body is left with an excess of negative charge and therefore becomes a negatively charged body. Of course, if positive charge is added to a neutral body, then that body becomes a positively charged body. Or, if negative charge is added to a neutral body, that body then becomes a negatively charged body. It should also be mentioned that, while electric charge can be transferred from one body to another, it can never be destroyed; this is a basic law of nature, and is known as THE PRINCIPLE OF CONSERVATION OF ELECTRIC CHARGE. Let us next discuss induced electrical charges. Suppose we have a round ball of conducting material (aluminum, for instance), resting on a dry insulating stand, as shown in Fig. 3, where it s assumed the aluminum ball is in an electrically neutral state.
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