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E-Field Models

E-Field Models There are several E-field situations—charge models—that we’ll study. One model is the net (total) field produced by one or more discrete point charges . The other, more general, models are the net (total) fields produced by a variety of continuous charge distributions :

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E-Field Models

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  1. E-Field Models There are several E-field situations—charge models—that we’ll study. One model is the net (total) field produced by one or more discrete point charges. The other, more general, models are the net (total) fields produced by a variety of continuouscharge distributions: Short lines Rings Spheres Long lines Disks 1 or 2 large plates (planes) Oregon State University PH 213, Class #5

  2. E-field of a line of charge (along its bisector) (Example 26.3, pp. 758-759) Oregon State University PH 213, Class #5

  3. Use the above result (including the large-L approximation) in HW2-3, problems 3b and 3c. Then HW2-3, problem 3d asks you to derive likewise for the E-field along the axis (not the bisector) of a short line of charge. Oregon State University PH 213, Class #5

  4. The rod has a continuous and uniform net charge distribution. Which of the following actions will increase the electric field strength at the position of the dot? • Lengthen the rod without moving its center or changing its charge • Widen the rod without moving its center or changing its charge • Shorten the rod without moving its center or changing its charge • None of the above. Oregon State University PH 213, Class #5

  5. Axial E-field of a thin ring of charge (Example 26.4, pages 760-761) Use the above result in HW2-3, problems 4a and 4b. Oregon State University PH 213, Class #5

  6. Axial E-field of a thin disk of charge (Pages 761-762) Use the above result in HW2-3, problem 4c. Oregon State University PH 213, Class #5

  7. What is the differential amount of area dA, of a ring of width dR at a distance R from the center? • 2πR • πR2 • (2πR) dR • (πR2 )dR Oregon State University PH 213, Class #5

  8. A Disk of Charge Oregon State University PH 213, Class #5

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