Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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Textbook Question
Chapter 12, Problem 19P
Find the magnetic flux
Fig.12.46
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Which of the following is true about the magnetic field in the Biot-Savart law?I. is inversely proportional to r.II. It is inversely proportional to r2.III. It is directly proportional to the current.
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1. A solenoid 20 cm long is wound with 300 turns of wire and carries a current of 1.5 A. What is the approximate relative permeability of this core so as to produce a magnetic field of 0.6 T inside?
A. 225
B. 212
C. 210
D. 280
8. Two coils have inductance of 4 mH and 9 mH and coefficient of coupling is 0.50. If the two coils are connected in series opposing, the total inductance will be
A. 10 mH
B. 8 mH
C. 9 mH
D. 7 mH
1.23 The symmetric magnetic circuit of Fig. 1.33 has three windings. Windings A
and Beach have N turns and are wound on the two bottom legs of the core.
The core dimensions are indicated in the figure.
a. Find the self-inductances of each of the windings.
b. Find the mutual inductances between the three pairs of windings.
c.
Find the voltage induced in winding 1 by time-varying currents iA (t) and
iB (t) in windings A and B. Show that this voltage can be used to measure
the imbalance between two sinusoidal currents of the same frequency.
LA
N turns
1½
N₁ turns
8
N turns
Core:
Area Ac
Permeability
Figure 1.33 Symmetric magnetic circuit for Problem 1.23.
Chapter 12 Solutions
Introductory Circuit Analysis (13th Edition)
Ch. 12 - Using Appendix E, fill in the blanks in the...Ch. 12 - Repeat Problem 1 for the following table if...Ch. 12 - For the electromagnet in Fig. 12.34 a. Find the...Ch. 12 - Which section of Fig. 12.35-(a), (b), or (c)-has...Ch. 12 - Find the reluctance of a magnetic circuit if a...Ch. 12 - Prob. 6PCh. 12 - Find the magnetizing force H for Problem 5 in SI...Ch. 12 - If a magnetizing force H of 600 At/m is applied to...Ch. 12 - For the series magnetic circuit in Fig. 12.36,...Ch. 12 - Find the current necessary to establish a flux of...
Ch. 12 - a. Find the number of turns N1 required to...Ch. 12 - a. Find the mmf (NI) required to establish a flux...Ch. 12 - For the series magnetic circuit in Fig.12.40 with...Ch. 12 - a. Find the current I required to establish a flux...Ch. 12 - Prob. 15PCh. 12 - Determine the current I1 required to establsh a...Ch. 12 - a. A flux of 0.210-4Wb will establish sufficient...Ch. 12 - For the series-parallel magnetic circuit in Fig....Ch. 12 - Find the magnetic flux established in the series...Ch. 12 - Prob. 20PCh. 12 - Note how closely the B-H curve of cast steel in...
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- Q24) please answer fast needarrow_forwardTwo identical coils X and Y of 500 turns each lie in parallel planes such that 80% of flux produced by one coil links with the other. If a current of 5 A flowing in X produces a flux of 10 mWb in it, find the mutual inductance between X and Yarrow_forwardAn iron core 0.4 m long and 5 square cm in cross section, is wound with 300 turns. When a current of 0.5 Aflows in the coil, how much is the inductance of the coil. Assume the core has a permeability of 2500arrow_forward
- 2. Syngas enegy content is about....... a. Two time of natural gas b. Half of natural gas c. No energy is availablearrow_forwardA coil consists of 750 turns. A current of 10A in the coil gives rise to a magnetic flux of 1200 Wb.Determine the inductance of the coil.arrow_forward6. A copper coil has a resistance of 200 ohms temperature is 0 degree centigrade. Calculate the resistance of the coil when its mean when its mean temperature is 80 degree centigrade. Temperature coefficient of copper is 0.004041 centigradearrow_forward
- When one coil of a magnetically coupled pair has a current of 5 A, the resulting fluxes 11 and 12 are 0.40 mWb and 0.80 mWb, respectively. If the number of turns N1 and N2 are 500 and 1500, respectively, what is the self-inductance L2? a. 560 mH b. 1080 mH c. 540 mH d. 1060 mHarrow_forwardThe number of turns in a coil is 600. When a current of 4 A flows in this coil, the flux produced is 0.6 mwb. When the current is reduced to zero in 6 milli seconds, the voltage induced in a coil is 65 volts. If the coefficient of coupling between the coils is 0.8, find the self-inductance of the two coils, mutual inductance and number of turns in the second coil.arrow_forwarda) A coil consist of 2000 turns of copper wire having a cross sectional area of 0.8mm?. The mean length per turn is 80 cm and the resistivity of copper is 0.02µN-m. Find the resistance of the coil and power absorbed by the coil when connected across 110V D.C supply.arrow_forward
- Get the value of IB . Show complete solution.arrow_forward1. A magnetic circuit constructed of sheet steel has an average length of 1.5 m and cross sectional area of 0.025 m². A 50 turns coil wound on the ring has a resistance of 0.8 Q and draws 4 A from A DC supply. The relative permeability is 5000. Determine a) The flux density. b) Voltage applied. c) If the material is replaced with another material with a relative permeability of 3000 and keeping the other parameters as it is then calculate the new flux and explain what happened.arrow_forwardb. three The allowable ampacity of a 4 AWG THHN conductor is 95 amperes. If we have four 4 AWG THHN conductors, what is the adjusted ampacity? a. 48 b. 63 C. 76 d. 95 o conductarrow_forward
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