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Class 013 - Coulomb's Law

# Class 013 - Coulomb's Law - a/an A Conductor B Electric...

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Charge Model & Coulomb’s Law What You Will Learn Today • What forces do charges apply on each other? • How do we determine the net force from multiple charges? Preparation for the next class • Read sections 20.4 –20.5 • Complete Homework 1, make progress on Homework 2

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Reading/Review Quiz 1. Last class, we saw that after the PVC pipe was rubbed with wool, it attracted the glass rod after it was rubbed with silk. If the net charge on the glass rod is positive, the net charge on the PVC pipe must be: A. Positive B. Negative C. Depends on the humidity in the room D. Depends on the temperature
Reading/Review Quiz 2. Charges move around freely in what kind of material(s)? A. Insulators B. Capacitors C. Conductors D. Resistors

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Reading/Review Quiz 3. When two equal but opposite charges are separated by a distance, the material is called

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Unformatted text preview: a/an: A. Conductor B. Electric dipole C. Insulator D. Transistor Reading/Review Quiz 4. The force between two charges decreases when (choose all that apply): A. The magnitude of either charge is increased B. The distance between the charges is increased C. The magnitude of either charge is decreased D. The distance between the charges is decreased Coulomb’s Law Net Force Between Charges 1. What is the force from Charge A on Charge B (F A )? 2. What is the force from Charge C on Charge B (F C 3. What is the net force on Charge B (F B Note: Specify both magnitude and direction for the forces. Do not forget units! K = 9.0 x 10 9 N. m 2 / C +20 nC +30 nC-10 nC 5 cm Preparation for the Next Class • Read sections 20.4 – 20.5 • Complete Homework 1, make progress on Homework 2...
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Class 013 - Coulomb's Law - a/an A Conductor B Electric...

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