Engineering Electromagnetics
9th Edition
ISBN: 9780078028151
Author: Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher: Mcgraw-hill Education,
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Chapter 4, Problem 4.12P
To determine
(a)
The potential at any point, when
To determine
(b)
The potential at any point, when
To determine
(c)
The potential at any point, when
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Q2.
22
A four-pole, 415 V 50Hz induction motor supplies its rated power to a
constant load. The rated speed of the motor is 1470 rpm.
i) Draw the equivalent electrical circuit of the motor
ii) Calculate the slip frequency and slip
iii) If the supply voltage is changed to 207.5 V_25 Hz, calculate the motor
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iv) Sketch torque-speed characteristics of the motor when the supply
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the 415 V_60 Hz case.
b) A synchronous generator connects to an infinite bus. The terminal voltage
VT and output current IA of the generator are shown in the phasor diagram
in Figure Q2. This generator is required to double its real power output by
increasing the governor's set point while maintaining the field current. With
the aid of the phasor diagram, analyse the effect of the change of
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The figure below shows a 50Hz balanced star-star three-phase circuit with line loss. The load impedance Z = 40 + j15.08 Ω.(a)Calculate the line load impedance ZL.(b)Determine the average power:(i)Delivered by the three-phase source.(ii)Delivered to the three-phase load.(iii)Absorbed by the three-phase line.(c)Calculate the power efficiency of the system.
Three concentric spherical shells 7=1, 7=2, 7=3 m, respectively, have
charge distriutions 2, 4 and 5 μC/m².
(a) Calculate the flux through 7=1.5 m² and r = 2.5m.
(b) Find D at 7=0.5m, r=2.5m, and r=3.5m .
Chapter 4 Solutions
Engineering Electromagnetics
Ch. 4 - Given E = Exax + Eyay + Ez3z V/m, where EX, Ey,...Ch. 4 - A positive point charge of magnitude q1 lies at...Ch. 4 - Given E=Epap+Ea+Ez+azV/m, where Ep, E and E2 are...Ch. 4 - An electric field in free space is given by...Ch. 4 - Consider the vector field G = (A/p) aa where A is...Ch. 4 - A electric field in free space is given as...Ch. 4 - Prob. 4.7PCh. 4 - Given E=-xax+yay,(a) find the work involved in...Ch. 4 - An electric field intensity in spherical...Ch. 4 - A sphere of radios a carries a surface density of...
Ch. 4 - At large distances from a dipole antenna (to be...Ch. 4 - Prob. 4.12PCh. 4 - Thee identical point charges of 4 pC each are...Ch. 4 - Given the electric field E=(y+1)ax+(x1)ay+2az find...Ch. 4 - Two uniform lines, 8 nC/m, are located at x=1, z=2...Ch. 4 - A spherically symmetric charge distribution in...Ch. 4 - Uniform surface charge densities of 6 and 2 nC/m2...Ch. 4 - Find the potential at the origin produced by a...Ch. 4 - Volume charge density is given as pv=poer/C/m3,...Ch. 4 - En a certain medium, the electric potential is...Ch. 4 - Prob. 4.21PCh. 4 - A Line charge of infinite length lies along the z...Ch. 4 - Prob. 4.23PCh. 4 - A certain spherically symmetric charge...Ch. 4 - Consider an electric field intensity in free space...Ch. 4 - Let us assume that we have a very thin, square,...Ch. 4 - By performing an appropriate Line integral from...Ch. 4 - Prob. 4.28PCh. 4 - A dipole having a moment P=3ax-5ay+10aznC.m is...Ch. 4 - Prob. 4.30PCh. 4 - A potential field in free space is expressed as...Ch. 4 - Prob. 4.32PCh. 4 - Prob. 4.33PCh. 4 - A sphere of radius a contains volume charge of...Ch. 4 - Four 0.8 nC point charge are located in free space...Ch. 4 - Surface charge of uniform density ps lies on a...
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