Second Exam121205 - ‫ﺑﺴﻢ اﷲ اﻟﺮﲪﻦ...

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Unformatted text preview: ‫ﺑﺴﻢ اﷲ اﻟﺮﲪﻦ اﻟﺮﺣﻴﻢ‬ Department of Electrical and Computer Engineering Module 0404215 Electromagnetic (I) Q1 Q2 First Exam 12/12/2005 Time allowed: 1 hour → Using the differential form of Gauss’s law ( ∇. D = ρ v ) derive in detail the integral form of Gauss’s law? (6 points) Obtain an expression for the capacitance of the coaxial cable shown in Figure 1? (Note that for the given voltage V acroos the capacitor , charge +Q and –Q will accumulate on the surfaces of the outer and inner conductors, respectively) Figure 1 (5 points) Q3 Determine the electric flux density at point (4, 0 , 3) if there is a point charge -5 π mC at the point (4, 0 , 0) and a line charge 3 π mC/m along the y-axis? (5 points) Q4 Given a certain charge distribution, what are the various approaches which can be used to compute the electric field? (4 points) ...
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