Electronics Fundamentals: Circuits, Devices & Applications
8th Edition
ISBN: 9780135072950
Author: Thomas L. Floyd, David Buchla
Publisher: Prentice Hall
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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 1.75 A. The core is square in section with sides of 20mm. Take the relative permeability of soft iron as 1100. Determine the total flux
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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- The 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_forwardThe negative field intensity required to force the residual magnetism is known as Magnetic field intensity Magnetomotive force Magnetic field density Coercive forcearrow_forwardThe corecivity of a small magnet where the ferromagnet gets demagnetized is 3 x 10³ Am-¹1 The current required to be passed in a solenoid of length 10cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid is:arrow_forward
- 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°?arrow_forwardIf there is a current of 2 A flowing counterclockwise in the coil (as seen from the +z direction) what is the magnitude of the torque on the loop due to the above magnetic field? Enter a description of your calculations and your final answer in the text box (just as if it were a HW assignment) BIU - I E Barrow_forwardA DC motor armature draws 150 A while generating a magnetic flux of 0.02 Wb. The armature constant is K = 1 V min/Wb. What is most nearly the motor's developed torque? 28.65 n-m 50.3 n-m O 4,73 n-m O 11.70 n-marrow_forward
- QUESTION 6 A DC motor armature draws 150 A while generating a magnetic flux of 0.02 Wb. The armature constant is K = 1 V min/Wb. What is most nearly the motor's developed torque? 28.65 n-m 50.3 n-m 4,73 n-m O 11.70 n-marrow_forwardWhat is MMF? O Magnetic Machine Force Magnetomotive Force Magnetic Motion Force Magnetomotion Forcearrow_forwardWhich 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_forward
- A bar magnet with a 1 inch square cross section is said to have a total magnetic flux of 500 maxwell. Determine the flux density in tesla.arrow_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_forwardmagnetic forcearrow_forward
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