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Unformatted text preview: Electrostatic Potential for Ring of Charge Instructor Guide Keywords: Upperdivision, E and M, Electrostatic Potential, Symmetry, Ring Brief overview of the activity In this activity, students work in small groups to write the electrostatic po tential everywhere in space due to a charged ring. This activity brings together student understanding of: 1. Electrostatic potential 2. Spherical and cylindrical coordinates 3. Superposition 4. Integration as chopping and adding 5. Linear charge density 6. 3dimensional geometric reasoning 7. Power series expansion Student prerequisite skills This activity is may be used as the second in a sequence, following the elec trostatic potential  discrete charges activity, or may be used on its own. Students will need understandings of: 1. The prerequisites addressed in the electrostatic potential  discrete charges activity . 2. Spherical and cylindrical coordinates. Link to spherical and cylindrical coordinates activity . 3. Integration as chopping and adding. Link to Integration activity. 1 4. Linear charge density Props Hula hoop or other thin ring Balls to represent point charges Voltmeter Coordinate system (e.g. with straws or Tinkertoys) Postersized whiteboards markers whiteboards around room. Link to room setup . The activity  Allow 50 minutes. Overview Part I Students should be assigned to work in groups of three and given the following instructions using the visual of a hula hoop or other large ring: This is a ring with total charge Q and radius R . Find the electrical potential due to this ring in all space. Students do their work collectively with markers on a postersized sheet of whiteboard at their tables. Link to worked solution resulting in an elliptic integral . Part II Students determine the power series expansion to represent the electrostatic potential due to the charged ring along a particular axis. Link to worked solutions for power series expansions. Note: students should not be told about part II until they have completed part I....
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This note was uploaded on 04/03/2008 for the course PHY 150 taught by Professor Culbertson during the Fall '06 term at ASU.
 Fall '06
 Culbertson
 Charge, Work

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