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Unformatted text preview: 1 Kuwait University Physics Department Physics 102 Final Exam Summer Semester (20082009) August 16, 2009 (5:00 7:00 p.m.) Name: ………………………… Student No: ……………….. Instructors: Drs. Abel Karim, Afrousheh, Davis, Marafi, Ramadan, Razee, Manaa, Kota Rao (Fundamental constants ) k = 2 2 9 C / m . N 10 . 9 4 1 × = πε ο (Coulomb constant) ε o = 8.85 × 1012 C 2 / (N ¡ m 2 ) (Permittivity of free space) μ = 4 π × 107 T .m/A (Premeability of free space) e = 1.60 × 1019 C (Elementary unit of charge) N A = 6.02 × 10 23 (Avogadro’s number) g = 9.8 m/s 2 (Acceleration due to gravity) m e = 9.11 × 1031 kg (Electron mass) m p = 1.67 × 1027 kg (Proton mass) Prefixes of units m = 103 μ = 106 n = 109 p = 1012 k = 10 3 M = 10 6 G = 10 9 T = 10 12 For use by Instructors only Problem 1 2 3 4 5 6 7 8 9 10 Total Marks Question 1 2 3 4 5 6 7 8 9 10 Total Marks 2 Part I: Solve the following problems 1. Point charges q 1 = +5.0 nC and q 2 = ─7.0 nC below are a distance d = 0.50 m apart. The magnitude of the electric field of q 1 at point A is 370 N/C. Find the magnitude of the electric field of q 2 at A. 3 points m 35 . E kq r r kq E 1 1 q 1 1 1 2 1 q = = → = ( ) C / N 87 m 85 . 63 r q k E 2 2 2 2 q 2 + = = = 2. Two infinite uniform lines of charge in the xyplane cross at the origin (see below); , m / nC . 2 1 + = λ m / nC 5 . 1 2 − = λ . Find the xcomponent E x of the net electric field at point P with coordinates x = 0 m, y = 2.0 m. 3 points θ λ + = = cos r k 2 E E 2 2 x 2 x C / N 14 E m 2 r , 45 x 2 = → = = θ o x d q 1 q 2 A (0, 2) P 45° 3 3. The axis of a very long conducting cylinder (of radius R = 0.30 m) is on the yaxis (see figure). The cylinder has surface charge density . m / C . 4 2 μ = σ Calculate the magnitude of the potential difference between the point A (at x = 0 m) and B (at x = 4.0 m) shown in the figure. between the point A (at x = 0 m) and B (at x = 4....
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 Spring '07
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