Midterm2 Solutions

# Midterm2 Solutions - Physics 7B Fall 2009 Sections 2 and 3...

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Physics 7B, Fall 2009, Sections 2 and 3, Instructor: Professor Adrian Lee Second Midterm Examination, Tuesday November 3, 2009 Please do work in your bluebooks. You may use one double-sided 3.5” x 5” index card of notes. Test duration is 90 minutes. 1) Giancoli 22-63: One very large slab is in the middle of two sheets with all separations equal to d. The sheets are the end are very thin and non-conducting and have charge per unit area of + σ and – σ respectively. The middle slab has width and is conducting but has no net charge. For all parts, show your reasoning by simple equations or statements. Do not simply write down the answer, even if you can. [25 pts. total] a) What is the electric field inside the middle sheet? [5 pts.] b) What is the electric field between the left and middle sheets? [5 pts.] c) What is the electric field between the middle and right sheets? [5 pts.] d) What is the charge density on the surface of the middle sheet facing the left sheet? [5 pts.] e) What is the charge density on the surface of the middle sheet facing the right sheet? [5

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