Electronics Fundamentals: Circuits, Devices & Applications
8th Edition
ISBN: 9780135072950
Author: Thomas L. Floyd, David Buchla
Publisher: Prentice Hall
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Chapter 7, Problem 3ST
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A rectangular coil of wire has a length of 3 cm and a width of 4 cm. It is in a 0.004 T magnetic field. What is the magnetic flux through the coil if the face of the coil is parallel to the B-field lines? What is the flux if the angle between the face of the coil and the magnetic field is 75°?
3- A magnetic core with an air gap is shown in below Figure. The depth of the core is 3 cm, the length of the air
gap in the core is 4 cm, and the number of turns on the coil is 100. How much current is required to produce
total flux of 0.00052 Weber? (H= 2000, Ho=4.n107).
6 cm
20 cm
N = 100
4 cm = lg
6 cm
6 cm
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12 cm
18 cm
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Depth = 3 cm
How many ampere-turn are required to produce a field intensity of 4000 Ampere-turn/m in a magnetic circuit of length 4 mm ?
Chapter 7 Solutions
Electronics Fundamentals: Circuits, Devices & Applications
Ch. 7 - The tesla (T) and the gauss (G) are both units for...Ch. 7 - The unit for measuring magnetomotive force (mmf)...Ch. 7 - Ohm’s law for a magnetic circuit gives the...Ch. 7 - A solenoid is a form of electromagnetic switch...Ch. 7 - A hysteresis curve is a plot of flux density (B)...Ch. 7 - To produce an induced voltage in a coil, the...Ch. 7 - Prob. 7TFQCh. 7 - Prob. 8TFQCh. 7 - Prob. 9TFQCh. 7 - Prob. 10TFQ
Ch. 7 - Prob. 1STCh. 7 - Prob. 2STCh. 7 - Prob. 3STCh. 7 - Prob. 4STCh. 7 - Prob. 5STCh. 7 - Prob. 6STCh. 7 - Prob. 7STCh. 7 - The electromagnetic activation of a movable shaft...Ch. 7 - When there is current through a wire placed in a...Ch. 7 - Prob. 10STCh. 7 - Prob. 11STCh. 7 - Prob. 12STCh. 7 - Prob. 13STCh. 7 - Prob. 14STCh. 7 - Prob. 15STCh. 7 - The cross-sectional area of a magnetic field is...Ch. 7 - In a certain magnetic field the cross-sectional...Ch. 7 - Wha is the flux in a magnetic material when the...Ch. 7 - At a given location, the earth’s magnetic field...Ch. 7 - A very strong permanent magnet has a field of...Ch. 7 - Prob. 6PCh. 7 - What is the relative permeablility of a...Ch. 7 - Determine the reluctance of a material with a...Ch. 7 - What is the magnetomotive force in a 500 turn coil...Ch. 7 - Typically, when a solenoid is activated, is the...Ch. 7 - Prob. 11PCh. 7 - Explain the sequence of events in the circuit of...Ch. 7 - Prob. 13PCh. 7 - What is the magnetizing force in Problem 9 if the...Ch. 7 - How can the flux density in Figure 7-51 be changed...Ch. 7 - In Figure 7-51, determine the following if the...Ch. 7 - Determine from the hysteresis curves in Figure...Ch. 7 - According to Faraday’s law, what happens to the...Ch. 7 - The voltage induced across a certain coil is...Ch. 7 - Prob. 20PCh. 7 - A 20 cm long conductor is moving upward between...Ch. 7 - Prob. 22PCh. 7 - If a generator is 80% efficient and delivers 45 W...Ch. 7 - Prob. 24PCh. 7 - If the output voltage in Problem 24 is 14 V, what...Ch. 7 - Prob. 26PCh. 7 - Prob. 27PCh. 7 - A basic one-loop de generator is rotated at 60...Ch. 7 - Assume that another loop of wire. 90 from the...
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- Consider a coil as Figure 10 turns, placed in a magnetic field B= (100 x2 cos 103t) az T and R=10000 Determine the current in the circuit. The units of length are in m R -0.1 + Vemf 0.1 -0.1 B 0.1arrow_forwardA magnetic circuit has a length of 100 cm and cross-sectional area of 5 square cm. The total flux is 10 x 104 webers. The coil has 100 turns and current of 4 amperes. What is the magnetic strength? a. 500 AT/m b. 400 AT/m c. 350 AT/m d. 450 AT/marrow_forwardFind the Magnetic field stenghth from the curvearrow_forward
- uèstion 5 Consider the magnetic circuit in Figure. Assuming that the core u= 1000uo has a uniform cross section of 4 cm N= 400, the flux density in the air gap. 0.2 A L-42 cm 04-0.1 cm 35.4 mwb 605 mwb 70 8 mwb archarrow_forward5. Plot of B vs.n. Magnetic Field vs. Number of Turns per Length 20 40 60 80 120 -0.005 y = 0.0003x-0.0311 R = 0.8861 -0.01 -0.015 -0.02 -0.025 Number of Turns per Length what kind of relationship can you take from the graph, in equation form? Magnetic field (B) in Teslaarrow_forwardA long solenoid has 500 turns per cm and carries a current I. The magnetic field density at its center is 7.54 × 10-2 wb m²2. Another long solenoid has 300 turns per cm and it carries a current . What is the value of magnetic field at the center? 1.50 x 10-2 Wb/m² O 1.50 × 10-5 Wb/m2 O 5.65 × 10-3 Wb/m2 O 1.05 × 10-3 Wb/m2arrow_forward
- хх X X X ххх ххх ххх ххх 14 - x x x x x X ххх ххх x x x x x xWhat is the initial direction of the deflection of the charged particle as it enters the magnetic field shown in the figure? A) no deflection O B) into the page C) down (bottom of the page) O D) up (top of the page) out of the pagearrow_forward1-22. For the figure below, determine the magnetic field intensity in A/m and its direction (into or out of the paper) at point P between the two straight wires. 10A 6mm 4mm 20Aarrow_forwardYou have a solenoid with an into all current of 577A and a turn dentistry of 6601 loops/m What is the intial magnetic field through the solenoid ? the current in the solenoid drops to 34 A over the course of 4ms. What is the final magetic field through the solenoid ? the coil has a resistance of 20. What is the current though the coil? what is the power disssipated by the coil? inside the solenoid 56loops and a radius of 6.2cm. What is the magnitude of the induced in the 56 turn coil. Positive nunberarrow_forward
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