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10: The value of B at H-0 in a Hysteresis curve is called A) Remanence. B) Coercivity. C) Magnetization. D) Porosity 11: Ferites are a sub-group of

10: The value of B at H-0 in a Hysteresis curve is called A) Remanence. B) Coercivity. C) Magnetization. D) Porosity 11: Ferites are a sub-group of

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter12: Electronic Control Devices
Section: Chapter Questions
Problem 14RQ
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10: The value of B at H-0 in a Hysteresis curve is called A) Remanence. B) Coercivity. C) Magnetization. D) Porosity 11: Ferrites are a sub-group of A) Non-magnetic materials, B) Ferro-magnetic materials, C) Paramagnetic materials, D) Ferri-magnetic materials. . 12: Find the true statement. A) Most of the substances show ferromagnetism, B) The magnetic susceptibility of diamagnetic substances are temperature independent, C) Water is paramagnetic in nature, D) Typical domain size of a ferromagnetic material is I nm. 13: Mutual inductance between two magnetically coupled coils depends on A) Permeability of the core material, B) Number of turns of the coils C) Cross sectional area of their common core, D) All of the above. 14: Which of the following circuit elements will oppose the change in circuit current? A)Capacitance. B) Inductance, C) Resistance, D) All of the above. 15: If the current in one coil is steady, what happens to the mutual inductance? A) Zero, B) Infinity. C) Doubles, D) Halves. 16: If the flux linkage in coil I is 3Wb and it has 500 turns and the current in coil 2 is 2A. calculate the mutual inductance. A) 750H, B) 500H, C)450H. D) 900H. 17: As Faraday's laws of electromagnetic induction, an em.f. is induced in a conductor whenever it. (A) Lies perpendicular to the magnetic flux, (B) Lies in a magnetic field. (C) Cuts magnetic flux, D) Moves parallel to the direction of the magnetic ficld. 18: Calculate the emf when the flux is given by 3sin t+ Scos t A) 3cos t - Ssin t. B) -3cost+ 5Ssin t. C) -3sin t-Scos t, D) 3cos t+ Ssin t. 19:The magnetic field inside a long solenoid, carrying current of 10 A, is Ex 10-2 T. What is the number of turns per unit length of the solenoid? A)2000 turns m", B)1000 turns m", C) 2500 turns m", D)S000 turns m" 20: Variation of magnetic field inside a toroid? A)lncreases from one end to other. B)Decreases from one end to other. C) Zero. . D)Remains constant. 02A) a proton moves at 7.50 x 10 perpendicular to a magnetic field. The field causes the proton to travel in a circular path of radius Im. What is the field strength? (a) at what speed will a proton move in a circular path of the same radius as the electron (b) What would the radius be if the proton had the same momentum? BỊ The current in a 50-mH inductor is given by I= Le" where =10A and b = 10s. What is the magnitude of the inductor emf at (a)t = 07
Transcribed Image Text:10: The value of B at H-0 in a Hysteresis curve is called A) Remanence. B) Coercivity. C) Magnetization. D) Porosity 11: Ferrites are a sub-group of A) Non-magnetic materials, B) Ferro-magnetic materials, C) Paramagnetic materials, D) Ferri-magnetic materials. . 12: Find the true statement. A) Most of the substances show ferromagnetism, B) The magnetic susceptibility of diamagnetic substances are temperature independent, C) Water is paramagnetic in nature, D) Typical domain size of a ferromagnetic material is I nm. 13: Mutual inductance between two magnetically coupled coils depends on A) Permeability of the core material, B) Number of turns of the coils C) Cross sectional area of their common core, D) All of the above. 14: Which of the following circuit elements will oppose the change in circuit current? A)Capacitance. B) Inductance, C) Resistance, D) All of the above. 15: If the current in one coil is steady, what happens to the mutual inductance? A) Zero, B) Infinity. C) Doubles, D) Halves. 16: If the flux linkage in coil I is 3Wb and it has 500 turns and the current in coil 2 is 2A. calculate the mutual inductance. A) 750H, B) 500H, C)450H. D) 900H. 17: As Faraday's laws of electromagnetic induction, an em.f. is induced in a conductor whenever it. (A) Lies perpendicular to the magnetic flux, (B) Lies in a magnetic field. (C) Cuts magnetic flux, D) Moves parallel to the direction of the magnetic ficld. 18: Calculate the emf when the flux is given by 3sin t+ Scos t A) 3cos t - Ssin t. B) -3cost+ 5Ssin t. C) -3sin t-Scos t, D) 3cos t+ Ssin t. 19:The magnetic field inside a long solenoid, carrying current of 10 A, is Ex 10-2 T. What is the number of turns per unit length of the solenoid? A)2000 turns m", B)1000 turns m", C) 2500 turns m", D)S000 turns m" 20: Variation of magnetic field inside a toroid? A)lncreases from one end to other. B)Decreases from one end to other. C) Zero. . D)Remains constant. 02A) a proton moves at 7.50 x 10 perpendicular to a magnetic field. The field causes the proton to travel in a circular path of radius Im. What is the field strength? (a) at what speed will a proton move in a circular path of the same radius as the electron (b) What would the radius be if the proton had the same momentum? BỊ The current in a 50-mH inductor is given by I= Le" where =10A and b = 10s. What is the magnitude of the inductor emf at (a)t = 07
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