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Announcements

Announcements. Exams will be returned at the END of class today!! Homework for tomorrow… (Ch . 29 CQ 2, Probs. 8, 11, & 14) 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

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Announcements

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  1. Announcements • Exams will be returned at the END of class today!! • Homework for tomorrow… (Ch. 29 CQ 2, Probs. 8, 11, & 14) • 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 29 Potential & Field (Sources of Electric Potential & Finding the Electric Field from the Potential)

  3. Review… • Electric potential difference from the Electric field… • Graphically: • ΔV = negative of the area under the E vs. s curve between si & sf The emf of the battery is the work done per charge… (ideal battery)

  4. Batteries and emf Q: What is the potential difference of two batteries in series? • A: The sum of their terminal voltages.

  5. 29.3:Finding the E-field from the Potential Calculate the potential difference between pointsiand f…

  6. 29.3:Finding the E-field from the Potential Calculate the potential difference between pointsiand f… Component of E-field in the s direction!

  7. Finding the E-field from the Potential i.e. Calculate the E-field of a point charge from the electric potential…

  8. Quiz Question 1 At which point is the E-field stronger? • At xA. • At xB. • The field is the same strength at both. • There’s not enough information to tell.

  9. i.e. 29.3The E-field of a ring of charge i.e. Calculate the E-field (on axis) of a ring of charge from the electric potential…

  10. i.e. 29.4Finding E from the slope of V The figure below is a graph of the electric potential in a region of space where E is parallel to the x-axis. Draw a graph of Ex versus x.

  11. i.e. 29.4Finding E from the slope of V The figure below is a graph of the electric potential in a region of space where E is parallel to the x-axis. Draw a graph of Ex versus x.

  12. The Geometry of Potential and Field Consider two equipotential surfaces, with V+ positive relative to V- … Notice: • E is perpendicular to the equipotential surfaces and points “downhill” in direction of decreasing potential.

  13. i.e. 29.5: Finding the E-field from the equipotential surfaces Estimate the strength and direction of the E-field at pts. 1, 2, & 3.

  14. i.e. 29.5: Finding the E-field from the equipotential surfaces Estimate the strength and direction of the E-field at pts. 1, 2, & 3.

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