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Announcements

Announcements. 1 st EXAM on Tuesday, February 18! Homework for tomorrow… (Ch . 28 CQ 8, Probs. 13 & 15) Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am Tutorial Learning Center (TLC) hours: M 8 -1 pm, 3-6 pm, W 8-1 pm, 2-6 pm TR 8-6 pm, F 8-2 pm.

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Announcements

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  1. Announcements • 1st EXAM on Tuesday, February 18! • Homework for tomorrow… (Ch. 28 CQ 8, Probs. 13 & 15) • Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am • Tutorial Learning Center (TLC) hours: M 8-1 pm, 3-6 pm, W 8-1 pm, 2-6 pm TR 8-6 pm, F 8-2 pm

  2. Chapter 28 The Electric Potential (The Electric Potential)

  3. Last time… Electric Potential Energy between 2 pt. charges…

  4. Multiple Point Charges What is the electric potential energy of 4 pt charges? q4 r14 q1 r24 r12 r34 r13 q2 r23 q3

  5. i.e. 28.4: Launching an electron Three electrons are spaced 1.0 mm apart along a vertical line. The outer two electrons are fixed in position. • Is the center electron at a point of stable or unstable equilibrium? • If the center electron is displaced horizontally by a small distance, what will its speed be when it is very far away?

  6. 28.4: The Electric Potential Force on q, due to some source charge Electric field, due to some source charge Potential energy between q & source Potential energy per charge?

  7. 28.4: The Electric Potential Force on q, due to some source charge Electric field, due to some source charge Potential energy between q & source Potential of source charge

  8. The Electric Potential or SI Units: Notice: • The electric potential, like the E-field, is a property of source charge(s).

  9. Using the Electric Potential… For +q moving to the right: • Vincreases, U increases, K decreases For +q moving to the left: • Vdecreases, Udecreases, K increases • What about for a –q?

  10. i.e. 28.6: Moving through a potential difference A proton with a speed of 2.0 x 105 m/s enters a region of space in which source charges have created an electric potential. What is the proton’s speed after it moves through a potential difference of 100V? What will be the final speed if the proton is replaced by an electron?

  11. 28.5: The Electric Potential Inside a Parallel-Plate Capacitor The Electric Potential Energy of a charge q in the uniform E-field of a parallel-plate capacitor is… • So, what’s the Electric Potential? q + +++++++++++++++++++++++++++++++ -------------------------------------------------------

  12. 28.5: The Electric Potential inside a Parallel-Plate Capacitor The Electric Potential Energy of a charge q in the uniform E-field of a parallel-plate capacitor is… So, what’s the Electric Potential? where s is the distance from the negative electrode. +++++++++++++++++++++++++++++++ -------------------------------------------------------

  13. Quiz Question 1 A negative charge is moving through an electric field along a path consisting of 2 legs (A & B). Let W represent the work done by the field, and ΔV the change in potential. Which of the following statements is/are true: • WA > 0 • WB > 0 • ΔVA < 0 • ΔVA> 0 • I only • I and II • III only • I and III • II and IV

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