Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 59, Problem 9SQ
To determine
List the probable causes for the failure of a coil to pick up.
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A plane wave in a nonmagnetic medium has E
=
50 sin (10% + 2z) a, V/m. Find
(a) The direction of wave propagation
(b) λ, f, and ε,
(c) H
Answer: (a) along -z direction, (b) 3.142 m, 15.92 MHz, 36, (c) 0.7958
sin(10% + 2z) a A/m.
The magnetic field component of a plane wave in a lossless dielectric is
=
(a) If μ, 1, find ε,.
H = 30 sin (2 × 10 - 5x) a, mA/m
(b) Calculate the wavelength and wave velocity.
(c) Determine the wave impedance.
(d) Determine the polarization of the wave.
(e) Find the corresponding electric field component.
(f) Find the displacement current density.
Medium characterized by, σ = 0,μ = 2μ。 and e
=
56 .If
H = 2 cos(wt-3y) azcalculateE, w
Chapter 59 Solutions
Electric Motor Control
Ch. 59 - Prob. 1SQCh. 59 - Why should the motor be run for a period of time...Ch. 59 - What may occur if a jumper is placed across coil M...Ch. 59 - In what position do ball-bearing motors function?Ch. 59 - Motors will operate satisfactorily at what percent...Ch. 59 - What basic sensory faculties should a...Ch. 59 - What is an orderly step-by-step procedure in...Ch. 59 - What might be a hazard if a motor is started in...Ch. 59 - Prob. 9SQCh. 59 - What are the probable causes of a noisy magnet?
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