Electric Fields

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Electric Fields

  1. 1. ELECTRIC FIELDS
  2. 2. <ul><li>A field is a region where a non contact force acts. </li></ul><ul><li>e.g. a gravity field </li></ul>Gravity force Gravity Field Force is in the direction of the field
  3. 4. <ul><li>Electric Fields are created by charged particles (electrons or protons) </li></ul>Force
  4. 5. Charged wire in oil. Floating threads show the field
  5. 6. <ul><li>Field lines are in the same direction as the force on a positive charge </li></ul>Force
  6. 7. extension <ul><li>Predict the shape of the field around a proton and an electron </li></ul>
  7. 9. <ul><li>Predict the shape of the field between a negative and positive plate. </li></ul>
  8. 11. Force on a charge in an Electric Field <ul><li>Force on a mass in a Gravity Field is </li></ul><ul><li>Force on a charge in an Electric Field is </li></ul>
  9. 12. Gravity Field Electric Field mass m charge +q force F force F h d Energy Changes in Fields
  10. 13. Particle Accelerators <ul><li>Particle Accelerators are designed to accelerate charged particles to very high speeds. </li></ul><ul><li>Uses range from TVs to huge colliders. </li></ul>
  11. 14. cathode anode filament
  12. 15. Kinetic energy gained by the electron is
  13. 16. LHC Cern circumference = 27 km depth= 100 m
  14. 17. Proton Tube
  15. 18. Particle Detector
  16. 19. Voltage <ul><li>When a charge moves between the plates, it gains or loses electrical potential energy. </li></ul>
  17. 20. Voltage <ul><li>The VOLTAGE is the energy gained (or lost) by a Coulomb of charge </li></ul>
  18. 21. an easier way to measure electric field strength……
  19. 22. excellence question 5000 V 20 mm Calculate the electron’s energy gain.
  20. 23. excellence question for 2.7 5000 V 20 mm Calculate the electron’s velocity as it passes through the hole.
  21. 24. Cathode Ray Tubes
  22. 26. Cathode Ray Tube
  23. 27. With switch open … With switch closed …
  24. 28. The downward force is constant so the path of the electron is a parabola

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