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Is tape the only object that you can charge Once again, stick one strip of tape to the desk and the second strip on top Label the bottom strip B and the top strip T Pull the pair off together Discharge them, then pull them apart Stick the handle end of each strip to the edge of a table, the bottom of a lamp shade, or some similar object The two should hang down a short distance apart Finally, rub a comb or pen on your clothing and bring it near one strip of tape and then the other You will find that one strip will be attracted to the comb, while the other will be repelled by it, as shown in Figure 20-2b You now can explore the interactions of charged objects with the strips of tape

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Experimenting with charge Try to charge other objects, such as glasses and plastic bags Rub them with different materials, such as silk, wool, and plastic wrap If the air is dry, scuff your shoes on carpet and bring your finger near the strips of tape To test silk or wool, slip a plastic bag over your hand before holding the cloth After rubbing, take your hand out of the bag and bring both the bag and cloth near the strips of tape Most charged objects will attract one strip and repel the other You will never find an object that repels both strips of tape, although you might find some that attract both For example, your finger will attract both strips You will explore this effect later in this chapter Types of charge From your experiments, you can make a list of objects labeled B, for bottom, which have the same charge as the tape stuck on the desk Another list can be made of objects labeled T, which have the same charge as the top strip of tape There are only two lists, because there are only two types of charge Benjamin Franklin called them positive and negative charges Using Franklin s convention, when hard rubber and plastic are rubbed, they become negatively charged When materials such as glass and wool are rubbed, they become positively charged Just as you showed that an uncharged pair of tape strips became oppositely charged, you probably were able to show that if you rubbed plastic with wool, the plastic became negatively charged and the wool positively charged The two kinds of charges were not created alone, but in pairs These experiments suggest that matter normally contains both charges, positive and negative Contact in some way separates the two To explore this further, you must consider the microscopic picture of matter.

effectively disconnected from the circuit, so the two 100k resistors will place the ADC reading near the middle of its range, that is, ADCval 127 (My actual ADC value in this situation was 134)

The result x % y is computed as x (x / y) * y using integer operations. If y is zero, a DivideByZero exception is thrown.

Figure 20-2 Strips of tape can be given opposite charges (a) and then be used to demonstrate the interactions of like and opposite charges (b)

Electric charges exist within atoms In 1897, JJ Thomson discovered that all materials contain light, negatively charged particles that he called electrons Between 1909 and 1911, Ernest Rutherford, a student of Thomson from New Zealand, discovered that the atom has a massive, positively charged nucleus When the positive charge of the nucleus equals the negative charge of the surrounding electrons, then the atom is neutral

Figure 20-3 When wool is used to charge a rubber rod, electrons are removed from the wool atoms and cling to the rubber atoms In this way, both objects become charged

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