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Homework Announcements and Electric Field Concepts

This announcement covers upcoming homework due tomorrow, including Chapter 25, Problem 62, and Chapter 26, Problems 3 and 5. Additionally, students are reminded of office hours and the Tutorial Learning Center (TLC) hours. The focus of Chapter 26 is on the electric field, discussing key concepts such as Coulomb's Law, the electric field of point charges, and dipole moments. Students will engage with practical problems related to the electric field, including calculations and diagrams of charge interactions.

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Homework Announcements and Electric Field Concepts

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  1. Announcements • Homework for tomorrow… (Ch. 25 Prob. 62, Ch. 26 Probs. 3 & 5 ) CQ13: a) 4F b) 4F 25.12: a) 0.90 N b) 0.90 m/s2 25.35: 4.3 x 10-3 N, 252° CCW • 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 26 The Electric Field (E-Field Models & E-Field of Multiple Point Charges)

  3. Last time… • The Electric Field is defined as… • The Electric Field of a point charge is… +

  4. Permittivity constant.. • Define a new constant.. • so that… • Coulomb’s Law becomes…

  5. Electric Fields & Superposition • Q: @ P, what is the electric field? P q1 q2 q3

  6. Electric Fields & Superposition • Q: @ P, what is the electric field? • A: @ P, P q1 q2 q3

  7. i.e. 26.1: The electric field of 3 equal pt. q’s Three equal positive point charges q are located on the y-axis at y = 0 and at y = ±d. What is the electric field at a point on the x-axis? q1 d P q2 x d q3

  8. i.e. 26.1: The electric field of 3 equal pt. q’s Three equal positive point charges q are located on the y-axis at y = 0 and at y = ±d. What is the electric field at a point on the x-axis? q1 d P q2 x d q3

  9. The Electric Field of a Dipole An Electric Dipole is… • 2 equal but opposite charges separated by a small distance. Kinds: • Permanent Electric Dipole (i.e. H2O) • Induced Electric Dipole (i.e. polarized atom) • Dipole Moment… +q s -q

  10. The Electric Field of a Dipole Calculate the electric field of a dipole on the axis of the dipole… y +q s x -q

  11. The Electric Field of a Dipole Calculate the electric field of a dipole on the axis of the dipole… Notice: r is distance measured from the center of dipole. y +q s x -q

  12. Quiz Question 1 The diagram shows a positive charge +q and a negative charge –q with the same magnitude. The electric field at point P on the plane that bisects the dipole is: • Up. • Down. • Left. • Right. • Zero. +q P -q

  13. The Electric Field of a Dipole Calculate the electric field of a dipole in the plane that bisects the dipole. y +q s x -q

  14. The Electric Field of a Dipole Calculate the electric field of a dipole in the plane that bisects the dipole. y +q s x -q

  15. The Electric Field of a Dipole Calculate the electric field of a dipole in the plane that bisects the dipole. Notice: field is opposite to p & half the strength of on-axis field. y +q s x -q

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