Physics 0175 - Hour Exam _1 cover page

# Physics 0175 - Hour Exam _1 cover page - PHYSICS 0175...

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PHYSICS 0175 Spring 2008 - P. Koehler First Hour Examination February 8, 2008 (8:00-8:50am) These two pages of equations and a calculator are the only aids you may use during the examination. The following information may be useful in answering the questions: c cos θ = b/c A circle of radius r has a sin θ = a/c area A = hr 2 and 90 ° θ tan θ = a/b circumference C = 2hr b c 2 = a 2 + b 2 A sphere of radius r has area A = 4 π r 2 and 1 μC = 10 -6 C; 1 nC = 10 -9 C volume V = (4/3) π r 3 Coulomb's Law: 1 2 2 C q q F k r q = r where 0 4 1 πε = k = 8.99 x 10 9 N m 2 /C 2 (like charges repel, unlike charges attract) = 0 ε 8.85 x 10 -12 C 2 /N m 2 Electric field: 0 C F E q = r r for small, positive q 0 ; E has SI units [N/C] = [V/m] Electric field at a distance r from a point charge q has magnitude: 2 q E k r = r (the electric field points away from a positive charge and towards a negative charge) Electric flux: E E A ∆Φ = r r [N·m 2 /C] Gauss's Law: 0 enc E q E dA Φ = = r

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## This note was uploaded on 04/18/2008 for the course PHYS 0175 taught by Professor Koehler during the Spring '08 term at Pittsburgh.

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Physics 0175 - Hour Exam _1 cover page - PHYSICS 0175...

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