Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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Chapter 12, Problem 8P
If a magnetizing force H of 600 At/m is applied to a magnetic circuit, a flux density B of
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A magnetic ring has a mean circumstance of 20 cm and a cross section of 20 cm2 and has 800 numbers of turns of wire. When the exciting current is 5 A, the flux is 2 mWb. The relative permeability of iron is nearly ?
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If a magnetizing force H of 600 At/m
established. Find the permeability
magnetizing force.
is applied to a magnetic circuit, a flux density B of 1200 × 10-4 Wb/m² is
of a material that will produce twice the original flux density for the same
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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- The applied MMF to a simple magnetic circuit is 350AT. It was found that the resulting magnetic field denstiy is 0.7 Wb/m2. The average length of this magnetic circuit is 1.64ft and its cross-sectional area is 4cm². What is the relative permeability of the magnetic material of the core?arrow_forwardThe applied MMF to a simple magnetic circuit is 350AT. It was found that the resulting magnetic field denstiy is 0.7 Wb/m². The average length of this magnetic circuit is 1.64ft and its cross sectional area is 4cm². What is the reluctance (in AT/Wb) of the magnetic material of the core?arrow_forwardF.) An iron core has a cross-sectional area of 10^(-3) square meter and mean circumference of 1 meter. The relative permeability of the material is 500 and the number of turns is 200. Determine the current required to set up a flux of 0.001 weber. a. 7.54 A b. 7.96 A c. 8.19 A d. 8.47 Aarrow_forward
- Figure 1 shows a ring formed with two different materials – cast steel and mild steel. Mild steel has a mean length of 400 mm and an area of 500 mm². Cast steel has a mean length of 300 mm and an area of 312.5 mm2. The magnetisation curve for mild steel and cast steel is shown in Figure 2. Find the total MMF required to cause a flux of 500 µWb in the magnetic circuit. Determine also the total circuit reluctance. 1.8 Cașt steel Cast-steel 1.6 Silicon iron 1.4 Mild steel 1.2 1.0 0.6 Mild stel Cast iron 0.6 Figure 1: Ring arrangement 0.4 0.2 3000 4000 Magnetic field strength, H(A/m) 1000 2000 5000 600ỘI 7000 Figure 2: Magnetization Curve MMF = AT Reluctance = x 10* ΑT/Wb Flux density, B(T)arrow_forwardA 0.5-m length of wire carries a 10-A current perpendicular to a magnetic field. Determine the magnetic flux density needed so that the force on the wire is 3 N.arrow_forwardWhat will be the reluctance of a magnetic core if the mean path length for flux is 0.04 m and the cross-sectional area is 0.001 sq. m.? The relative permeability of the core is equal to (8000/n). Express your answer in ampere-turns per weber, rounded off to the nearest hundred [100 A- t/Wb]. Answer:arrow_forward
- A magnetic pole face has a rectangular section having dimensions 200 mm by 100 mm. If the total flux emerging from the pole is 150 µWb. a) If the emerging flux of the pole is changed to 100µWb what will be the resultant density?c) When the dimensions of the magnetic pole are changed to 10m and 5m what will be the new density?d) What would happen if the magnetic pole is changed to square?arrow_forwardq1) Draw magnetization curve for iron under AC excitation at 0 Hz, 50 Hz, and 100Hz on the same graph. repeat part (1) for wood. What can be inferred from the fact that flux form closed paths.arrow_forwardThe relationship law between magnetic flux density, magnetic field strength and magnetization is given by: O a. Magnetic circuit law O b. The magnetic constitutive law O C. Temporary magnetization law Od. Magnetic flux lawarrow_forward
- The length of a magnetic circuit in a moving iron instrument is 300mm.The coil around the soft iron core has 360 turns and takes a current of 1.75A.The core is square in section with sides of 20mm.Take the relative permeability of soft iron as 1100. Determine the magnetomotive force in the core. Determine the field strength. Determine the flux density. Determine the total flux.arrow_forward4. Consider a coil of wire wrapped around an iron core. If the flux in the core is given by the equation o = 0. 5sinwtWb and if there are 200 turns on the core, what voltage is produced at the terminals of the coil?arrow_forwardA flux density of 1.2 T is produced in a piece of cast steel by a magnetizing force pf 1250A/m. find the relative permeability of the material.arrow_forward
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