EBK INTRODUCTORY CIRCUIT ANALYSIS
13th Edition
ISBN: 8220100668234
Author: Boylestad
Publisher: PEARSON
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Textbook Question
Chapter 12, Problem 11P
a. Find the number of turns N1 required to establish a flux
b. Find the permeability
Fig. 12.38
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A coil of inductance 8mH, produces 80µWb of magnetic flux. Of this total flux, 60µWb are linked to a second coil of inductance 2mH, how much is the mutual inductance between coils?
1. (a) Show that if three phase currents, each of equal magnitude and differing in phase by 120 degree, flow in a three phase winding that are 120 degree apart from each other then it will produce a rotating magnetic field of a fixed magnitude.
A magnetic circuit consists of an iron ring of mean circumference 80 cm with cross-sectional area 12cm2 throughout. A current of 2A in the magnetising coil of 200 turns produces a total flux of 1.2mWb in the iron. Calculate :
(a) the flux density in the iron(b) the absolute and relative permeabilities of iron(c) the reluctance of the circuit
[ANSWER: 1 Wb/m2 ; 0.002, 1,590 ; 3.33 × 105 AT/Wb]
Chapter 12 Solutions
EBK INTRODUCTORY CIRCUIT ANALYSIS
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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- A solenoid has a magnetic reluctance of 0.0022. It has 300 turns. If the current flowing is 0.5 A, find the total flux in maxwells.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_forwardA coil of 1000 turns is uniformly wound on a ring type non-magnetic material. The mean diameter and cross-sectional area of the ring are 20 cm and 4 cm^2. If the current flowing is 2 A, find the total flux in μWb.arrow_forward
- 13. A non-magnetic ring having a cross-sectional area of 10 cm2 is uniformly wound with 300 turns of a given wire. If a current of 1 A is passed through the coil, 2.4 µWb of flux generated inside the ring. Determine the average diameter of the ring.arrow_forwardIn a core with a 60-turn coil, a flux ø of 4.24 milliweber is generated due to a current i1 of 10 A that circulates through said coil, if the relative permeability of metal 1 is 500, Calculate the value of the permeability of metal 2.arrow_forwardexplain why Two coils are said to be mutually coupled if the magnetic flux Ø emanating from one pass through the other. The mutual inductance between the two coils is given by M=ksquare root of L1xL2arrow_forward
- The volume of a transformer core built up of silicon sheet steel laminations is 12000 cm3. If the maximum flux density is 1.0 Wb/m2, find the hysteresis loss in joule/m3 per cycle. The hysteresis coefficient is 250arrow_forward8. 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?arrow_forwardA coil of 500 turns is uniform wound on an iron ring having a mean circumference of 0.80 m . A flux density of 1.1 Wb/m^2 is developed in the iron when a current of 2 A is passed through the coil . Find the relative permeability of iron under these conditionarrow_forward
- A circular ring of iron having a cross sectional area of 5 cm2, an average diameter of 30 cm is wound with a coil of 1000 turns. If a current of 3 A is passed through the coil, determine the flux generated. Assume the permeability of iron is 250. machine subjectarrow_forwardA conductor passes 50 times per across the face of the pole of a field magnet having a flux density of 15000 lines per sq in the dimensions of the pole face are 20x20in. Determine the (a). total flux, (b) lines cut per second (c) voltage induced (average).arrow_forwardA current carrying conductor placed in a magnetic field experience a force, is it true for generators? Select one: O True O Falsearrow_forward
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