Engineering Electromagnetics
9th Edition
ISBN: 9781260029963
Author: Hayt
Publisher: MCG
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Chapter 5, Problem 5.28P
Find the dielectric constant of a material an which the electric flux density is four tunes the polarization.
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3. Consider the RC circuit with a constant voltage source shown in the diagram below. The
values of the resistor, capacitor, and input voltage are R = 50, C = 10 µF, and V = 6V,
respectively. Assume that there is initially no charge on the capacitor before the switch is
closed.
Vo
↑i(t)
R
w
C
When the switch closes at time t = 0, the current begins to flow as a function of time according
to the equation
i(t) = ioenc
Q2. a)
A three-phase 415 V, 4-pole, 50 Hz, A-connected induction motor was
tested. The obtained results are:
(i)
(ii)
No load test 50 Hz:
Blocked rotor test, 10 Hz:
DC test:
Vnl=415 V, Pnl=1200 W, In=11 A
Vbr 10 V, Pbr=1500 W, Ibr=91 A
VDC 3 V, IDC=107 A
Draw the per-phase equivalent electrical circuit of the motor
Draw the circuits for no-load and block-rotor tests and indicate the slip
for each of the tests.
(iii) Identify the motor parameters
(iv) Calculate the motor's starting torque at the rated voltage.
4. Consider the RC circuit with a sinusoid voltage source shown in the diagram below. The values
of the resistor, capacitor, input voltage amplitude and frequency are R-20012, C-5pF",
Vo-10V, and w=500 rad/s, respectively. Assume that the circuit has reached steady state.
Vрейте
2
The input voltage can be described using the complex sinusoid function
V(t)-Vo
and the physical voltage is obtained by taking the real part of V(t). The voltage drop across
the capacitor is given by a sinusoid with same the frequency was the input voltage, but a
different magnitude and different phase. In complex form, the capacitor's voltage is given by
Vc(t)=1+jwRC
For the following questions, use the template file Assignment TemplateQ2.m as the starting
point for your MATLAB code.
(a) (6 marks) Use MATLAB to make a graph that shows the real part of the input voltage
source ReV(t)] and the real part of the voltage drop across the capacitor Re[Ve(t)] as
a function of time. Choose the time scale so that two…
Chapter 5 Solutions
Engineering Electromagnetics
Ch. 5 - Prob. 5.1PCh. 5 - Given J=-10-4 (yaxx+ya) A/m2, find the current...Ch. 5 - A solid sphere of radius b contains charge Q....Ch. 5 - Prob. 5.4PCh. 5 - Consider the following time-varying current...Ch. 5 - Prob. 5.6PCh. 5 - Prob. 5.7PCh. 5 - Prob. 5.8PCh. 5 - Prob. 5.9PCh. 5 - A large brass washer has a 2-cm inside diameter, a...
Ch. 5 - Prob. 5.11PCh. 5 - Prob. 5.12PCh. 5 - Prob. 5.13PCh. 5 - A rectangular conducting plate lies in the xy...Ch. 5 - Prob. 5.15PCh. 5 - Prob. 5.16PCh. 5 - Consider the serup as in Problem 5.15, except find...Ch. 5 - Prob. 5.18PCh. 5 - Consider the as in Problem 5.8, except find R by...Ch. 5 - Consider the basic image problem of a point charge...Ch. 5 - Let the surface y=0 be a perfect conductor in free...Ch. 5 - The line segment x=0, -1≤y≤1, z=1, carries a...Ch. 5 - A dipole with P=0.1azμC. m is located at A(1,0,0)...Ch. 5 - At a certain temperature, the electron and hole...Ch. 5 - Electron and hole concentration increase with...Ch. 5 - A semiconductor sample has a rectangular cross...Ch. 5 - Atomic hydrogen contains 5.5Ă—1023 atoms/m at a...Ch. 5 - Find the dielectric constant of a material an...Ch. 5 - A coaxial conductor has radii a=0.8mm and b=3 mm...Ch. 5 - Consider a composite material made up of two...Ch. 5 - Prob. 5.31PCh. 5 - Two equal but p\opposite-sign point charges of...Ch. 5 - Two perfect dielectrics have relative...Ch. 5 - A sphere of radius b and dielectric constant £r...Ch. 5 - Prob. 5.35P
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Demos: Dielectric breakdown; Author: Caltech's Feynman Lecture Hall;https://www.youtube.com/watch?v=2YrHh1ikefI;License: Standard Youtube License