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Unformatted text preview: 1 Physics 208N-004 Lecture #5 21 January 2011 Electric Fields and Conductors 21-8, 21-9 Review: 1. Continuous Charge Distributions 2. Field Lines I will be away for a scientific conference next week. Prof. Richard Patty will be the instructor. You may reach at Richard_Patty@ncsu.edu if you have questions or problems. Remember to be diligent in working on the HW assignments, and that your first lab will meet next week. The electric field can be represented by field lines. These lines start on a positive charge and end on a negative charge . 21-8 Field Lines The number of field lines starting (ending) on a positive (negative) charge is proportional to the magnitude of the charge . The electric field is stronger where the field lines are closer together. Electric dipole : two equal charges, opposite in sign: 21-8 Field Lines The electric field between two closely spaced, oppositely charged parallel plates is constant. Summary of field lines: 1. Field lines indicate the direction of the field; the field is tangent to the line. 2. The magnitude of the field is proportional to the density of the lines....
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- Spring '09