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Announcements

Announcements. Homework for tomorrow… (Ch . 26 Probs. 50, Ch. 27 Probs. 26 & 27) CQ8: 2nC/cm 2 26.13: a) –(7.6 x 10 4 N/C) ihat b) (7.6 x 10 -5 N) ihat 26.15: 2.7 x 10 8 C Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am Tutorial Learning Center (TLC) hours:

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Announcements

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  1. Announcements • Homework for tomorrow… (Ch. 26 Probs. 50, Ch. 27 Probs. 26 & 27) CQ8: 2nC/cm2 26.13: a) –(7.6 x 104 N/C) ihat b) (7.6 x 10-5 N) ihat 26.15: 2.7 x 108 C • 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 27 Gauss’ Law (Conductors in Electrostatic Equilibrium)

  3. Last time… • E-field of a parallel-plate capacitor.. ------------------------------------------------------- +++++++++++++++++++++++++++++++

  4. Quiz Question 1 Which E-field is responsible for the proton’s trajectory? • (a) • (b) • (c) • (d) • (e)

  5. i.e. 26.9: Deflecting an e- beam An e- gun creates a beam of e-’s moving horizontally with a speed of 3.3 x 107 m/s. The e-’s enter a 2.0 cm long gap between two parallel electrodes where the electric field is E = -(5.0 x 104 N/C) jhat. In which direction, and by what angle, is the electron beam deflected by these electrodes?

  6. 27.6: Conductors in Electrostatic Equilibrium Consider a charged conductor in electrostatic equilibrium… • all charges are stationary. • E-field is ZERO at all points w/in the conductor. • Any excess q resides on the exterior surface.

  7. Conductors in Electrostatic Equilibrium Consider a charged conductor in electrostatic equilibrium… • E-field at the surface of a charged conductor.. • is perpendicular to the surface. • is of magnitudeη/ε0, where ηis the surface charge density at that pt.

  8. Conductors in Electrostatic Equilibrium Consider a charged conductor in electrostatic equilibrium… • E-field is ZERO inside any hole w/in a conductor, unless there is a q in the hole.

  9. Conductors in Electrostatic Equilibrium Q: How can we exclude an E-field from some region?

  10. Conductors in Electrostatic Equilibrium Q: How can we exclude an E-field from some region? A: Insert a neutral conducting box (a.k.a. Faraday cage)

  11. i.e. 27.7: The E-field at the surface of a charged metal sphere. A 2.0 cm diameter brass sphere has been given a charge of 2.0 nC. What is the E-field strength at the surface?

  12. Quiz Question 2 A point charge q is located a distance r from the center of a neutral metal sphere. The E-field at the center of the sphere is • 0 • It depends on what the metal is.

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