🔖 Topics

  • Electric charge
  • Conductors and insulators
  • Charging objects
  • Coulomb's law

🎯 Objectives

  • Describe the two types of electric charge
  • Describe the behavior of electric charges in conductors and insulators
  • Describe different ways of charging and discharging objects
  • Calculate the forces on point charges using Coulomb's law

📋 Sequence

  • Electric charge
    • Elementary charge \(e = 1.6 \times 10^{-19} \: C\)
  • “Ideal” conductors and insulators
  • Charging a material
    • Rubbing
    • Contact
    • Grounding
    • Induction
  • Coulomb’s law

🖥️ Animations, Simulations, Activities

N/A

📝 Practice Problems

  1. Two point charges, each with a charge of +1.5 mC are separated by a distance of 5.75 m. What is the magnitude of the electric force between the point charges? Do they attract or repel each other?

  2. A point charge of +15 \(\mu C\) is located at the point (1 m, 2 m). Another point charge of -15 \(\mu C\) is located at the point (0 m, -5 m). What is the electric force acting on the negative point charge from the positive one?

  3. A charge of 10 \(\mu C\) is positioned at the origin while another charge of -30 \(\mu C\) is positioned at the point (5 cm, 0 cm). Where around the two points (if anywhere) is the net electric force on a positive point charge equal to zero?

✅ Partial Solutions

  1. 612.48 N, Repel
  2. 0.0405 N, \(81.87^\circ\)
  3. (-6.83 cm, 0 cm)

📘 Connected Resources

  • Giambattista, Alan, et al. College Physics With an Integrated Approach to Forces and Kinematics. 5th ed., McGraw-Hill Education, 2020.