1 / 28

PHY 2049: Physics II

A uniform electric field, with a magnitude of 600 N/C, is directed parallel to the positive x-axis . If the potential at x = 3.0 m is 1 000 V, what is the potential at x = 1.0 m? a. 400 V b. 1 600 V c. 2 200 V d. 2 500 V. PHY 2049: Physics II.

luella
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. A uniform electric field, with a magnitude of 600 N/C, is directed parallel to the positive x-axis. If the potential at x = 3.0 m is 1 000 V, what is the potential at x = 1.0 m? a. 400 V b. 1 600 V c. 2 200 V d. 2 500 V PHY 2049: Physics II • Coulomb’s law, electric field, Gauss’ theorem and electric potential. • -W = qΔV • Energy conservation applies. U F V E

  2. PHY 2049: Class Quiz If 500 J of work are required to carry a charged particle between two points with a potential difference of 20V, the magnitude of the charge on the particle is: A. 0.040C B. 12.5C C. 20C D. cannot be computed unless the path is given E. none of these

  3. PHY 2049: Physics II What is the potential at the center point (in units of kq/d) ? a) -7 (b) -5 (c) -7 (d) -7

  4. PHY 2049: Physics II Calculate the Electric Field at P Calculate the el. potential at P

  5. PHY 2049: Physics II • Point charge • Distribution of charges • Line charge at an edge • Disc on an axis through the center

  6. Some old business: What is the electric field of a shell of a uniform spherical charge distribution? What is the potential for each of the above?

  7. PHY 2049: Physics II • Some old business The potential of a uniform spherical charge. • Calculate electric field, integrate it to get the potential E r R V V

  8. Two particles with charges Q and -Q are fixed at the vertices of an equilateral triangle with sides of length a. The work required to move a particle with charge q from the other vertex to the center of the line joining the fixed particles is: A. 0 B. kQq/a C. kQq/a2 D. 2kQq/a E. 1.4kQq/a

  9. PHY 2049: Physics II • a= 39 cm • q1 = 3.4pC • q2 = 6 pC • E at the center? • What is the potential at the center?

  10. PHY 2049: Physics II An outline • Capacitors, plate, coaxial, spherical.. • Energy, Dielectric strength, Dielectric constant. • Netweorks: Parallel and Series configuration.

  11. PHY 2049: Physics II • Capacitors: A device to hold charge. • It is held by Coulomb force between the charges. +q and –q on two separate places. • V : potential difference: q= CV • C: capacitance units farad.

  12. PHY 2049: Physics II

  13. PHY 2049: Physics II

  14. Potential near a sheet charge

  15. Potential near a sheet charge

  16. PHY 2049: Physics II

  17. PHY 2049: Physics II

  18. PHY 2049: Physics II

  19. HITT • A uniform electric field, with a magnitude of 600 N/C, is directed parallel to the positive x-axis. If the potential at x = 3.0 m is 1000 V, what is the potential at x = 1.0 m? a. 400 V b. 1600 V c. 2200 V d. 2500 V

  20. PHY 2049: Physics II • What is the capacitance of various familiar balls. C = 4πεoR = 10-10 R(m) F • Basketball-it is an insulator • Van de Graff top • Earth (radius 6.4 X 106 m) • CE = 0.71 mF

  21. PHY 2049: Physics II • Energy stored in a capacitor U = ½ CV2 = Q2/2C = ½ QV • Dielectric Strength (oops I burned it/broke it) • Capacitor Enhancement by inserting a dielectric: • Replace εo by κεo

  22. PHY 2049: Physics II

  23. PHY 2049: Physics II Ceq = C1+C2+C3

  24. PHY 2049: Physics II

  25. PHY 2049: Physics II • Charging and discharging of capacitors. • http://edugen.wiley.com/edugen/instructor/main.uni

  26. PHY 2049: Physics II 25.20

  27. PHY 2049: Physics II Switch closed on left, capacitor C1 is being charged We have C2 = C3 = 20 μF in parallel. The equivalent capacitor is then Ceq = 40 μF. When the switch is thrown to right, the battery is disconnected, the charge is shared between the capacitors C1 and Ceq = 40. What is the charge on old C2 and C3? Is your answer 40 μC? What is your answer if C2 = 10 μF and C3 = 30 μF?

  28. PHY 2049: Physics II • All about capacitors • Capacitance units Farad • C = 4 π κεo R for a sphere of radius R and dielectric constant κ. • Energy stored dielectrics and strength • Parallel and series elements in a network

More Related