PHYS1322-CH22Lec3

PHYS1322-CH22Lec3 - Lecture 6 Quiz Thursday and Friday...

This preview shows pages 1–3. Sign up to view the full content.

Lecture 6 a b c s S E dS Φ G G v Quiz, Thursday and Friday Group quiz Thursday ¾ 1 problem done in your group Individual quiz Friday ¾ 2 problems plus 5 multiple choice Problems on chapters 21-22 You may bring in one side of paper with notes Per group in the group quiz Per person in the individual •Field lines are a way of representing an electric field •Lines leave (+) charges and return to (-) charges •Number of lines leaving/entering charge charge •Tangent of line = direction of E •Local density of field lines local magnitude of E •Lines from an isolated charge go to infinity •Field lines cannot cross Last Week Rules for Field Lines + - Electric Dipole: Field Lines Consider imaginary spheres centered on : All lines leave a) All lines enter b) Equal amounts of leaving and entering lines for c) a a) + q (blue) b b) - q (red) c c) midpoint (yellow) Question 1 Examine the electric field lines produced by the charges in this figure. Which statement is true? (a) q 1 and q 2 have the same sign (b) q 1 and q 2 have the opposite signs and q 1 > q 2 (c) q 1 and q 2 have the opposite signs and q 1 < q 2 q 1 q 2 Field lines start from q 2 and terminate on q 1 . This means q 2 is positive; q 1 is negative; so, … not (a) Now, which one is bigger ? Note that more field lines emerge from q 2 than end on q 1 This indicates that q 2 is greater than q 1 Electric Fields from Continuous Charge Distributions Principles (Coulomb’s Law + Law of Superposition) remain the same. Only change: Examples: line of charge charged plates electron cloud in atoms, … ++++++++++++++++++++++++++ r E(r) = ? Σ →

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Lecture 6 Charge Densities How do we represent the charge “ Q ” on an extended object?
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern