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Understanding Electrostatic Forces: Coulomb's Law Explained

Learn how to charge an electroscope and measure electrostatic forces using Coulomb's Law. Practice problems included.

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Understanding Electrostatic Forces: Coulomb's Law Explained

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  1. Shocking • You charge a electroscope by grounding it and then bringing a positively charged insulator near the electroscope. Then you break the connection with the ground and move the positive charge away. • What is the charge on the top of the electrocope?

  2. Objectives • How do we explain and measure the forces that push the electroscope leaves apart? • Homework: Finish the worksheet! • Short Castle Learning

  3. Review Problems • Sheet • Worksheet

  4. Electrical Forces 4.1.3 Coulomb’s Law

  5. - Electrostatic Force Same charges REPEL + + Opposite charges ATTRACT +

  6. r Electrostatic Force • Amount of force depends on: • CHARGE ON EACH OBJECT • DISTANCE BETWEEN OBJECTS • ELECTROSTATIC CONSTANT: k = 8.99 x 109 N·m2/C2 q1 q2 Fe r

  7. r = 1.0 μm Electrostatic vs. Gravitational Force • Consider two electrons that are 1.0 micrometer apart. • Gravitationally ATTRACTED • Electrostatically REPELLED Fe Fe e- e- Fg Fg 2.30 x 10-16 N 5.54 x 10-59 N

  8. Example #1 • Determine the electrostatic force between an object with a +2.0 coulomb charge and an object with a -2.0 coulomb charge if they are separated by 2.0 meters. ATTRACTIVE

  9. Example #2 • Determine the electrostatic force between an object with -2.0 micro-coulombs of charge and an object with -5.0 micro-coulombs of charge if they are separated by 5.0 nanometers. REPULSIVE

  10. End of 4.1.3 - PRACTICE

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