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Shocking

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?. Objectives.

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Shocking

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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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