Electronics Fundamentals: Circuits, Devices & Applications
8th Edition
ISBN: 9780135072950
Author: Thomas L. Floyd, David Buchla
Publisher: Prentice Hall
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Textbook Question
Chapter 7, Problem 9P
What is the magnetomotive force in a 500 turn coil of wire with 3 A through it?
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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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- Which of the following is the analogous of current in an electrical circuit when it is compared to a magnetic circuit? Reluctance Magnetomotive force Magnetic flux Permeabilityarrow_forwardThe flux linking to 200 turns coil changes from 2 mWb to 5 mWb in 1ms to 3 ms. Determine the induced voltage.* 300 V 400 V 500 V 600 V What is the magnetomotive force created when 5 A current flows through 300 turns coil? * 1000 At 2000 At 1200 At 1500 Atarrow_forwardThe 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 1.75 A. The core is square in section with sides of 20mm. Take the relative permeability of soft iron as 1100. Determine the total fluxarrow_forward
- In the figure is shown a current of 50 A in a wire 120 cm long and at an angle of 45° to a magnetic field of flux density 6.0 x 10 -4 Wb/m2. What are the magnitude and direction of the force on this wire?arrow_forwardThe magnetic structure in the figure below is made of silicon steel. Determine the values of IB required in the winding of the figure below, to produce flux of OB=11mWb, l=0.03mm and NB=500 turns. 6 A B C \g 12 4 dimensions in cm 7 6 15 8 15 6arrow_forwardThe 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 1.75 A. The core is square in section with sides of 20 mm. Takethe relative permeability of soft iron as 1100. Determine the flux densityarrow_forward
- show thatvthis is a magnetic flux density: then prove and interpret it with reasons on each steparrow_forwardIn a certain magnetic circuit, the core is represented two reluctances as shown below. Assume a relative permeability r = 2500, and a number of turns N = 420 turns. Find the current needed to produce a flux of 10 mWb in the core. Fi Select one: a. i 95 mA O b. i 0.95 A O c. i 0,226 A O d. i 9.5 mA Oe. None RI E =15624 A.t/Wb Rgap = 24.2 KA.t/Wbarrow_forwardA solenoid is 1 Cm long with a diameter of 0.5 Cm. The core is SiFe with a relative permeability of 4200. Assuming a current of 100 mA, what is the maximum number of turns for the winding that keeps the core under the saturation magnetic field of about 1.5 Tesla?arrow_forward
- A magnetic circuit has a length of 100 cm and cross-sectional area of 5 square cm. The total flux is 10 x 10 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_forwardThe full-scale deflecting torque of a 20 A moving-iron ammeter is 6 x 10-5 N-m. What is the rate of change of self-inductance with respect to the deflection of the pointer of the ammeter at full scale?arrow_forwardA simple magnetic circuit is shown in Figure 1. The turn ratio is 250 turns and the current is 3.2 A. 15 cm 25 cm 25 cm N Figure 1: System for Q1 2 cm a) Draw the equivalent electric circuit and find the reluctance of each section. b) Find the total flux at the middle section of the circuit (where the winding is). c) Find the flux density at the right leg of the corearrow_forward
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