Phy102&09-I-ms2

Phy102&09-I-ms2 - Kuwait University Physics 102...

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Kuwait University Physics Department Physics 102 Fall Semester 2008-2009 Second Midterm Examination December 20, 2008 Time: 3.00 p.m. to 4.30 p.m. Name:………………………………. Student No:……………………. . Instructors: Drs. AbdelKarim, Afrousheh, Davis, Kokay, Lajko, Marafi, Rakhshani, Razee, Sabah & Sharma ____________________________________________________________ (Fundamental Constants) k == × 1 4 9.0 10 N m / C o 92 πε 2 (Coulomb constant) ε o = 8.85 × 10 -12 C 2 / (N · m 2 ) (Permittivity of free space) μ o = 4 π × 10 -7 T.m/A (Permeability of free space) e = +1.60 × 10 -19 C (Elementary unit of charge) N A = 6.022 × 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 Problems 1 2 3 4 5 6 7 8 Total Marks Questions 1 2 3 4 5 6 7 8 Total Marks
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Part I: Solve the following problems 1. When the switch S is closed in the following circuit, what is the final electric charge on the 3- µ F capacitor? ( 4 points ) 20 V S 4 μF 3 μF 1 μF 2 μF 1- µ F and 3- µ F equivalent capacitance: C 13 = 4 µ F & 1- µ F, 3- µ F and 4- µ F equivalent capacitance: C 134 = 2 µ F Q 13 = 20 C 134 = 40 µ C V 13 = Q 13 / C 13 = 1 0 V Q 3 = C 3 V 13 = 30 µ C 2. An air-filled parallel-plate capacitor is charged by connecting to a 45-V battery. The capacitor is then disconnected from the battery and a dielectric ( K=3 ) is inserted between the plates so that it fills only one-third of the space between the plates. What is the potential difference between the plates now? ( 4 points ) C 1 = ε o A/(2d/3) = 1.5C o ; C 2 = ε o
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This note was uploaded on 11/03/2009 for the course PHY 101 taught by Professor Exams during the Spring '07 term at Kuwait University.

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Phy102&09-I-ms2 - Kuwait University Physics 102...

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