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Key concepts of Chapter 25: Charge model Conservation of charge Insulators versus conductors

Key concepts of Chapter 25: Charge model Conservation of charge Insulators versus conductors Charged objects attract neutral objects by polarization Charging by induction Role of grounding Field model of how one charge influences another charge

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Key concepts of Chapter 25: Charge model Conservation of charge Insulators versus conductors

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  1. Key concepts of Chapter 25: • Charge model • Conservation of charge • Insulators versus conductors • Charged objects attract neutral objects by polarization • Charging by induction • Role of grounding • Field model of how one charge influences another charge • Coulomb's law: quantitative statement of how one point charge affects another point charge when both are moving slowly compared to speed of light.

  2. QuickCheck 25.11 The direction of the force on charge –q is • Up. • Down. • Left. • Right. • The force on –q is zero. Slide 25-85

  3. QuickCheck 25.10 Which is the direction of the net force on the charge at the top? E. None of these. Slide 25-79

  4. QuickCheck 25.13 The units of a unit vector are • Meters. • Coulombs. • The units depend on how it is used. • The unit vector has no units.

  5. QuickCheck 25.2 A rod attracts a positively charged hanging ball. The rod is • Positive. • Negative. • Neutral. • Either A or C. • Either B or C.

  6. QuickCheck 25.6 Identical metal spheres are initially charged as shown. Spheres P and Q are touched together and then separated. Then spheres Q and R are touched together and separated. Afterward the charge on sphere R is • –1 nC or less. • –0.5 nC. • 0 nC. • +0.5 nC. • +1.0 nC or more.

  7. QuickCheck 25.8 The charge of sphere 2 is twice that of sphere 1. Which vector below shows the force of 1 on 2 if the distance between the spheres is reduced to r/2? None of the above. Slide 25-72

  8. QuickCheck 25.3 Metal spheres 1 and 2 are touching. Both are initially neutral. • The charged rod is brought near. • The charged rod is then removed. • The spheres are separated. Afterward, the charges on the sphere are: • Q1 is + and Q2 is +. • Q1 is + and Q2 is –. • Q1 is – and Q2 is +. • Q1 is – and Q2 is –. • Q1 is 0 and Q2 is 0.

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