Phy102&amp;08-I-final

# Phy102&amp;08-I-final - Kuwait University Physics...

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Unformatted text preview: Kuwait University Physics Department Physics 102 Final Examination January 9, 2008 Time: 11.00 a.m. − 1.00 p.m. Name…………………………… Student No.………………. Instructors: Drs. AbdelKarim, Bhatia, Farhan, Kokaj, Davis, Manaa, Lajko, Razee, (Fundamental constants ) k = 2 2 9 C / m . N 10 . 9 4 1 × = πε ο (Coulomb constant) ε o = 8.85 × 10-12 C 2 / (N · m 2 ) (Permittivity of free space) μ = 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 Prob. 1 2 3 4 5 6 7 8 9 10 Total Marks Ques. 1 2 3 4 5 6 7 8 9 10 Total Marks Part - I 1. Three equal, point charges Q 1 , Q 2 , Q 3 are placed along a straight line, with the distance between neighbouring charges being 2 m as shown in figure below. If Q 1 = Q 2 = Q 3 & the magnitude of the net force acting on charge Q 3 is 1.125N. What is the magnitude of the charge? ( 2 points ) ( ) ( ) N q k q k 25 . 1 2 4 2 2 2 2 = + q = 20 μ C 2. In the figure a particle of charge +2 e is moved in from infinity to a point A on the x-axis. How much work is done if the distance d = 4m. ( 2 points ) Calculating the net potential at A Calculating the work ( )( ) ( ) d e d e e d e e W ο ο πε πε 2 2 2 2 2 4 1 =       + = W = 2.3 × 10-28 J Q 1 Q 2 Q 3 2m 2m d d +2e +e +2e ∞ x A 3. In the figure C 1 = C 2 = C 4 = 8 μ F and C 3 = 4 μ F. What is the potential difference across C 4 ?...
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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&amp;08-I-final - Kuwait University Physics...

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