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PY208-Lecture-4 - Physics 208N-004 Lecture#4 19 January...

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1 Physics 208N-004 Lecture #4 – 19 January 2011 Electric Fields – 21-7, 21-8 Review: 1. E-Field – force acting at a distance 2. Field is due to force exerted on a tiny positive charge E = F /q 3. Force on test charge 4. Photocopy machine 5. E-field acting on a point charge 6. E-field acting on two point charges 21-7 Electric Field Calculations for Continuous Charge Distributions A continuous distribution of charge may be treated as a succession of infinitesimal (point) charges. The total field is then the integral of the infinitesimal fields due to each bit of charge: Remember that the electric field is a vector; you will need a separate integral for each component.
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