1 / 25

PHY 2049: Physics II

PHY 2049: Physics II. We begin with a live clicker today. Wileyplus homework should be fully operational. Tea and Cookies: We meet on Tuesdays at 4:00PM for tea and cookies in room 2165. quiz.

sspangler
Download Presentation

PHY 2049: Physics II

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. PHY 2049: Physics II • We begin with a live clicker today. • Wileyplus homework should be fully operational. • Tea and Cookies: We meet on Tuesdays at 4:00PM for tea and cookies in room 2165.

  2. quiz • The electric field at a distance of 1 m from an isolated point particle with a charge of 2×10−9 C is: • A. 1.8N/C B. 180N/C C. 18N/C D. 1800N/C E. none of these

  3. Quiz 2 • An isolated charged point particle produces an electric field with magnitude E at a point 2m away from the charge. A point at which the field magnitude is 4E is: • A. 1m away from the particle • B. 0.5m away from the particle • C. 2m away from the particle • D. 4m away from the particle • E. 8m away from the particle

  4. PHY 2049: Physics II Last week • Coulomb’s law, Electric Field and Gauss’ theorem Today • Electric Potential Energy and Electric Potentials • Numerous cases

  5. Potential Energy and Potential • Force => work => change in K=> change in Potential energy • ΔU = Uf – Ui = -W = - ΔK • Work done is path independent. K+U = constant. U = k q1 q2/r : interaction energy of two charges. Sign matters

  6. PHY 2049: Physics II • Electric Potential • V = U/q = -W/q • Units of Joules/coulomb = volt • 1 eV = e x 1V = 1.6 x 10-19 J • Also • V = kq/r • Vf –Vi = -∫E.ds • In case of multiple charges, add as a number

  7. Neg., lower • ? • Pos., higher • Neg., higher • Pos., higher PHY 2049: Physics II Can you tell the sign of the charge by looking at its behavior over a surface of potentials. Is the speed at the end bigger or smaller than in the beginning.

  8. PHY 2049: Physics II • Vf-Vi = -∫ k q/r2 dr • Choose Vi = V (∞)=0 • V(r) = kq/r

  9. V = kpcosθ/r2 • E = -∂V/∂s = - • Uniformly charged disk • V = ??

  10. A C B (24 - 6)

  11. A O dq (24 - 8)

  12. PHY 2049: Physics II

  13. . P r dq (24 - 7)

  14. (24 - 9)

  15. (24 - 10)

  16. V  B A S q S V (24 - 11)

  17. (24 - 12)

  18. A B V+dV V (24 - 13)

  19. A B V+dV V (24 - 14)

  20. q2 y r12 r23 q1 r13 q3 x O (24 - 15)

  21. y Step 1  q1 x O  Step 2 q2 y r12 q1 x O Step 3 q2  r12 y q1 r23 r13 q3 O x (24 - 16)

  22. conductor path B A (24 - 17)

  23. (24 - 18)

  24. (24 - 19)

  25. R (24 - 20)

More Related