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Announcements

Announcements. Check your e-mail daily for announcements. If you are not subscribed to the listserv, you need to subscribe. See “Check your e-mail” on the class web page, http://www.wfu.edu/~matthews/courses/phy114/ .

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Announcements

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  1. Announcements • Check your e-mail daily for announcements. • If you are not subscribed to the listserv, you need to subscribe. See “Check your e-mail” on the class web page, http://www.wfu.edu/~matthews/courses/phy114/. • Lab grading policy linked from course page. Labs start Thursday! You must pass the lab to pass the course. • Reminder: lecture notes are online, as is a narrated Powerpoint on line charges.

  2. Electric Flux Electric flux is proportional to the total number of electric field lines through a surface (N.m2/C)

  3. Concept Question A cylindrical piece of insulating material is placed in an external electric field, as shown. The net electric flux passing through the surface of the cylinder is 1. positive. 2. negative. 3. zero.

  4. General Flux Definition

  5. Flux Through a Cube

  6. Start with a single charge and a spherical surface around it Generalize to any surface Calculate the flux through the sphere Gauss’s Law

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