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Chapter 17

Chapter 17. Electric Charge and Electric Field. 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.

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Chapter 17

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  1. Chapter 17 Electric Charge and Electric Field

  2. 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

  3. Exploring the nature of electrical charge - Figure 17.1 • Plastic, silk, rubber, glass and fur can reveal fundamental behaviors of charge.

  4. Atom Picture

  5. Atomic charge arrangements – Figures 17.2, 17.3 • Protons (+) and electrons (-) account for atomic charges. • Electrons move, protons don’t.

  6. 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.

  7. Charging by induction – Figure 17.5 • If attracted or repelled, the electrons inside an object may be polarized.

  8. Static effects even uncharged objects – Figure 17.6

  9. Polarization (the paper and the comb) – Figure 17.8 Induced charges are present in the everyday examples.

  10. Polarization determines induced charge – Figure 17.7

  11. How Coulomb measured the force – Figure 17.9 • Read through the text on pages 552-553.

  12. 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!

  13. Forces are additive – Example 17.3 Refer to the worked problem on page 556 and figure 17.11.

  14. Forces are additive even if non-linear – Example 17.3 Refer to the worked problem on page 557 and figure 17.12.

  15. Mapping out the electrical field – Figures 17.14-15 Moving the test charge can allow forces to be measured.

  16. Force causes acceleration – Example 17.5 Refer to the worked problem on page 559 and figure 17.16.

  17. Calculating the electric field – Example 17.6 Refer to the worked problem on page 561 and figure 17.17.

  18. The field around a dipole – Example 17.7 Refer to the worked problem on pages 562-563 and figures 17.18 and 17.19.

  19. The electric field is mapped – Figures 17.21-17.22 Refer to the characteristics at the bottom of page 563.

  20. The field formed related to the electrode – Figure 17.23 Refer to the text in the middle of page 564.

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