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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 www.Husni.net ...
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This note was uploaded on 04/02/2012 for the course ENGINEERIN 110409221 taught by Professor Omarsarayra during the Spring '12 term at Hashemite University.
- Spring '12