# lect3 - Physics 202 Lecture 3 Todays Topics Review Electric...

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Physics 202, Lecture 3 Today’s Topics Review Electric field and force Calculate Electric Field With Superposition (Direct Sum/Integral of Coulomb’s Law) Calculate Electric Field With Gauss’s Law Electric Flux (Ch 24.1) Gauss’s Law (Ch 24.2 – 3) Examples

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Reminder Homework will be available on WebAssign at 8 PM on Wednesday every week, due at 11 PM following week. First one available: Wed. Jan. 26 @ 8 PM First one due: Wed. Feb. 2 @ 11 PM Maximum of 5 trials allowed. No labs this week. They will start next week.
3 Review: Electric Field and Electric Force q 0 q r q 0 : source charge E: field by q 0 q: test charge F = qE force on q by E Electric Field is a form of matter. It carries energy (later in the semester)

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4 How to Calculate Electric Field? Single point-like : Multiple charges : (superposition principle) Continuous Charge Distribution: Note:For now, we assume charges are not moving. (electrostatic) E = k e q 0 r 2 ˆ r
5 Example: Charged Rod A uniformly charged rod of length L has a total charge Q, find the electric field: at point A (along the same line as the rod) at point B (distance b above the rod, halfway in x) at an arbitrary point C.

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lect3 - Physics 202 Lecture 3 Todays Topics Review Electric...

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