Chapter 19 Electric Charges, Forces, and Fields
Chapter 19
Electric Charges, Forces, and Fields
Outline 19-1 Electric Charge 19-2 Insulators and Conductors 19-3 Coulomb's Law (and net vector force) 19-4 The Electric Field 19-5 Electric Field Lines 19-6 Shield and Charging by Induction 19-7 Electric Flux and Gauss's Law
19-1 Electric Charge
Objectives:
? What is electric charge ? How it is created ? Electric charge properties
The effect of electric charge have been known for a long time.
Figure 19-1 Charging an Amber Rod
(a). Uncharged amber exert no force on papers.
(b). Rod amber is rubbed against a piece of fur.
(c). Amber become charged and then attracts the papers.
Figure 19-2 Likes Repel, Opposites Attract
Amber (-) + Amber (-) : Repel
Amber (-1) + glass (+) : Attract
Conclusions: There are two type of charges (in amber and glass), which is illustrated in Fig. 19-2
? Positive charge (+) ? Negative charge (-)
Properties
? The "like" or same charges repel. ? The opposite or different charges attract.
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