Fundamentals of Applied Electromagnetics (7th Edition)
7th Edition
ISBN: 9780133356816
Author: Fawwaz T. Ulaby, Umberto Ravaioli
Publisher: PEARSON
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Textbook Question
Chapter 1.3, Problem 2CQ
What is Coulomb’s law? State its properties.
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Question 3
a. Some materials exhibit the property of superconductivity under certain conditions.
State what is meant by superconductivity and explain the required conditions for the
material to become superconducting.
b. The diagram below shows the cross-section of a cable consisting of parallel filaments
that can be made superconducting, embedded in a cylinder of copper.
copper cylinder
filament
The cross-sectional area of the copper in the cable is 2.28 x 10-7 m². The resistance
of the copper in a 1.0 m length of the cable is 0.075 N. Calculate the resistivity of the
copper, stating an appropriate unit.
State and explain the what happen to the resistance of the cable when the
embedded filaments of wire are made superconductive?
i.
Discussions:Voltage Distribution and String Efficiency of a Model Suspension Insulator
1- Comment on the results obtained.2- Give reasons for unequal potential distribution over the string.3- What is the effect of this un equality on the insulators?4- Can value of the string efficiency being equal to 100%. Explain your answer.5- Outline methods used to equalize the potential across the units.6- Why an insulator is represented as a capacitor C? What are the assumptionmodes?
Mid-term exam Principles of Electricity (cont'd)
11. According to Ohm's Law, electron flow is
proportional to electrical
pressure.
a. Inversely
b. Indirectly
c. Directly
d. Not
12. What equation represents the characteristics of electron flow in a parallel circuit?
a. E=IxR
b. ET=E1=E2=E3...
c. IT=l1+l2+l3...
d. ET=E1+E2+E3...
13. What equation represents the characteristics of electrical pressure in a parallel
circuit?
a. E=IxR
b. ET=E1=E2=E3...
c. IT=l1+l2+l3...
d. ET=E1+E2+E3..
14. How much electrical pressure would be required to produce 25A current in a
circuit with 19.20 total resistance?
a. 480A
b. 480V
C. 1.3V
d. 0.768V
15. As resistors are removed from a series circuit, what will happen to the current?
a. The current will increase
b. The current will decrease
c. The current will stay the same
d. There is not enough information given
Chapter 1 Solutions
Fundamentals of Applied Electromagnetics (7th Edition)
Ch. 1.3 - Prob. 1CQCh. 1.3 - What is Coulombs law? State its properties.Ch. 1.3 - What are the two important properties of electric...Ch. 1.3 - What do the electrical permittivity and magnetic...Ch. 1.3 - What are the three branches and associated...Ch. 1.4 - How can you tell if a wave is traveling in the...Ch. 1.4 - Prob. 7CQCh. 1.4 - Why does a negative value of 0 signify a phase...Ch. 1.4 - Consider the red wave shown in Fig. E1.1. What is...Ch. 1.4 - The wave shown in red in Fig. E1.2 is given by...
Ch. 1.4 - The electric field of a traveling electromagnetic...Ch. 1.4 - Prob. 4ECh. 1.4 - The red wave shown in Fig. E1.5 is given by...Ch. 1.4 - An electromagnetic wave is propagating in the z...Ch. 1.5 - What are the three fundamental properties of EM...Ch. 1.5 - What is the range of frequencies covered by the...Ch. 1.5 - Prob. 11CQCh. 1.6 - Express the following complex functions in polar...Ch. 1.6 - Show that 2j=(1+j). (See EM.)Ch. 1.7 - Prob. 12CQCh. 1.7 - How is the phasor technique used when the forcing...Ch. 1.7 - A series RL circuit is connected to a voltage...Ch. 1.7 - A phasor voltage is given by V=j5V. Find (t).Ch. 1 - A 2 kHz sound wave traveling in the x direction in...Ch. 1 - For the pressure wave described in Example 1-1,...Ch. 1 - A harmonic wave traveling along a string is...Ch. 1 - A wave traveling along a string is given by...Ch. 1 - Two waves, y1(t) and y2(t), have identical...Ch. 1 - The height of an ocean wave is described by the...Ch. 1 - A wave traveling along a string in the +x...Ch. 1 - Two waves on a string are given by the following...Ch. 1 - Give expressions for y(x, t) for a sinusoidal wave...Ch. 1 - An oscillator that generates a sinusoidal wave on...Ch. 1 - Prob. 11PCh. 1 - Given two waves characterized by...Ch. 1 - The voltage of an electromagnetic wave traveling...Ch. 1 - A certain electromagnetic wave traveling in...Ch. 1 - Prob. 15PCh. 1 - Prob. 16PCh. 1 - Complex numbers z1 and z2 are given z1=3j2z2=4+j3...Ch. 1 - Complex numbers z1 and z2 are given by...Ch. 1 - If z=2+j4, determine the following quantities in...Ch. 1 - Find complex numbers t=z1+z2 and s=z1z2, both in...Ch. 1 - Complex numbers z1 and z2 are given by...Ch. 1 - If z=3j5, find the value of ln(z).Ch. 1 - If z = 3 j4. find the value of ez.Ch. 1 - Prob. 24PCh. 1 - A voltage source given by s(t)=25cos(2103t30)(V)...Ch. 1 - Find the phasors of the following time functions:...Ch. 1 - Find the instantaneous time sinusoidal functions...Ch. 1 - A series RLC circuit is connected to a generator...Ch. 1 - The voltage source of the circuit shown in Fig....
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