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17 Electric Charge and Electric Field Lectures by James L. Pazun Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Goals for Chapter 17 • To study electric charge, conductors, and insulators. • To understand Coulomb’s law and solve some example problems. • To understand electric fields. • To calculate electrical forces. • To map out electric field lines Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Electrical charges are all around us. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Exploring the nature of electrical charge - Figure 17.1 • Plastic, silk, rubber, glass and fur can reveal fundamental behaviors of charge. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Atomic charge arrangements – Figures 17.2, 17.3 • Protons (+) and electrons (-) account for atomic charges. • Electrons move, protons don’t. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Charge movement by conduction – Figure 17.4 •Direct contact •Charge moves through a conductor. – Metals are good conductors – Non-metals are most often not • Discuss insulators. •Discuss semiconductors. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Charging by induction – Figure 17.5 •If attracted or repelled, the electrons inside an object may be polarized. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Static effects even uncharged objects – Figure 17.6 Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Polarization (the paper and the comb) – Figure 17.8 Induced charges are present in the everyday examples. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Polarization determines induced charge – Figure 17.7 Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley How Coulomb measured the force – Figure 17.9 • Read through the text on pages 552553. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Electrical force – Examples 17.1 and 17.2 • Refer to the problem solving strategy on page 554 then try examples 17.1 and 17.2. • The problems build complexity in layers be sure to do these two! Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Forces are additive – Example 17.3 Refer to the worked problem on page 556 and figure 17.11. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Forces are additive even if non-linear – Example 17.3 Refer to the worked problem on page 557 and figure 17.12. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Mapping out the electrical field – Figures 17.14-15 Moving the test charge can allow forces to be measured. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Force causes acceleration – Example 17.5 Refer to the worked problem on page 559 and figure 17.16. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley Calculating the electric field – Example 17.6 Refer to the worked problem on page 561 and figure 17.17. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley The field around a dipole – Example 17.7 Refer to the worked problem on pages 562-563 and figures 17.18 and 17.19. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley The electric field is mapped – Figures 17.21-17.22 Refer to the characteristics at the bottom of page 563. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley The field formed related to the electrode – Figure 17.23 Refer to the text in the middle of page 564. Copyright © 2012 Pearson Education, Inc. publishing as Addison-Wesley