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Phy102&amp;09-S-ms2

# Phy102&amp;09-S-ms2 - Kuwait University Physics 102...

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1 Kuwait University Physics Department Physics 102 Second Midterm Exam Summer Semester (2008-2009) August 5, 2009 (6.00- 8:00 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 0 . 9 4 1 × = πε ο (Coulomb constant) ε o = 8.85 × 10 -12 C 2 / (N · m 2 ) (Permittivity of free space) μ 0 = 4 π × 10 -7 T .m/A (Premeability of free space) e = 1.60 × 10 -19 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 × 10 -31 kg (Electron mass) m p = 1.67 × 10 -27 kg (Proton mass) Prefixes of units m = 10 -3 μ = 10 -6 n = 10 -9 p = 10 -12 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 Total Marks Question 1 2 3 4 5 6 7 8 Total Marks

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2 Part I: Solve the following problems 1. In the circuit shown, the capacitor is initially uncharged. The switch S is closed at time t=0. Find the current in the circuit when the charge on the capacitor is 20 μ C. (2 pts) c q RI + = ε A 4 R c q I μ = ε = 2. In the circuit shown ε =15 V. Find the current in the 15 Ω resistor. (3 pts) Ω = Ω + Ω = 25 . 6 75 . 3 5 . 2 R eq A 4 . 2 R I eq = ε = A 6 . 0 15 75 . 3 A 4 . 2 I : 15 in = Ω Ω × = Ω 10V 2M Ω S 10 μ F 2.5 Ω 15 Ω ε 5 Ω
3 3. A parallel-plate capacitor with plate area 0.2 m 2

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