second Exam 110506 - ‫ﺑﺴﻢ اﷲ اﻟﺮﲪﻦ...

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Unformatted text preview: ‫ﺑﺴﻢ اﷲ اﻟﺮﲪﻦ اﻟﺮﺣﻴﻢ‬ Department of Electrical and Computer Engineering Module: Electromagnetic (I) Second Exam 11/05/2006 Time: 1 hour Instructor: Dr. Omar Saraereh Q1: A wire of diameter 1mm and conductivity 5 × 10 7 S / m has 1029 free electrons/m3 when an electric field of 10 mV/m is applied. Find: a) The charge density of free electrons b) The current density c) The current in the wire d) The drift velocity of the electrons (4 marks) Q2: Consider an infinite charge with density ρ l C/m located at a distance h from the perfect grounded conducting plane z = 0. Derive an expression for (a) the electric field and (b) the potential at point P in free space? (8 marks) Q3: Determine the capacitance if ε r1 = 4, ε r 2 = 6, d = 5mm, A = 30cm 2 ? of each (a) of the capacitors shown in Fig.1 (8 marks) (b) Figure 1 ...
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