Ch 206 - M02_PETR4521_10_SE_C02.QXD 8:05 PM Page 39 2ND...

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2-2 Electrons and Other Discoveries in Atomic Physics 39 some positive and negative charges (Fig. 2-4). Moreover, when a stationary (static) positive charge builds up in one place, a negative charge of equal size appears somewhere else; charge is balanced. Figure 2-5 shows how charged particles behave when they move through the field of a magnet. They are deflected from their straight-line path into a curved path in a plane perpendicular to the field. Think of the field or region of influence of the magnet as represented by a series of invisible “lines of force” running from the north pole to the south pole of the magnet. The Discovery of Electrons CRT, the abbreviation for cathode-ray tube, was once a familiar acronym. Before liquid crystal display (LCD) was available, the CRT was the heart of computer monitors and TV sets. The first cathode-ray tube was made by Michael Faraday (1791–1867) about 150 years ago. When he passed electric- ity through glass tubes from which most of the air had been evacuated,
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