MIMI. Consider a solenoidal coil initially carrying a time-varying current i(t) wrapped around a second coil. If the current in the first solenoid is set to 2i(t), which of the following quantities would double in magnitude for the second solenoid (assuming these quantities are measured at the same instant in time)? 1. Mutual inductance II. Magnetic flux III. Induced EMF 20 OA. I only OB. II only O C. I and III OD. II and III

MIMI. Consider a solenoidal coil initially carrying a time-varying current i(t) wrapped around a second coil. If the current in the first solenoid is set to 2i(t), which of the following quantities would double in magnitude for the second solenoid (assuming these quantities are measured at the same instant in time)? 1. Mutual inductance II. Magnetic flux III. Induced EMF 20 OA. I only OB. II only O C. I and III OD. II and III

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter20: Induced Voltages And Inductance

Section: Chapter Questions

Problem 12P: Medical devices implanted inside the body are often powered using transcutaneous energy transfer...

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An N-turn circular wire coil of radius r lies in the xy-plane (the plane of the page), as in Figure P20.10. A uniform magnetic field is turned on, increasing steadily from 0 to B0 in the positive z-direction in t seconds. (a) Find a symbolic expression for the emf, , induced in the coil in terms of the variables given. (b) looking down on at the xy-plane from the positive z-axis, is the direction of the induced current clockwise or counterclockwise? (c) If each loop has resistance R, find an expression for the magnitude of the induced current, I.
A 120-V, series-wound dc motor draws 0.50 A from its power source when operating at full speed, and it draws 2.0 A when it starts. The resistance of the armature coils is 10 , (a) What is the resistance of the field coils? (b) What is tire back emf of the motor when it is running at full speed? (c) The motor operates at a different speed and draws 1.0 A from the source. What is the back emf in this case?
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What is the value of the magnetic flux through the coil in Figure 23.56 (b) due to the wire?
A magnetic field of magnitude 0.300 T is oriented perpendicular to the plane of a circular loop. (a) Calculate the loop radius if the magnetic flux through the loop is 2.70Wb. (b) Calculate the new magnetic flux if the loop radius is doubled.
At the moment t = 0, a 24.0-V battery is connected to a 5.00-mH coil and a 6.00- resistor. (a) Immediately thereafter, how does the potential difference across the resistor compare to the emf across the coil? (b) Answer the same question about the circuit several seconds later. (c) Is there an instant at which these two voltages are equal in magnitude? If so, when? Is there more than one such instant? (d) After a 4.00-A current is established in the resistor and coil, the battery is suddenly replaced by a short circuit. Answer parts (a), (b), and (c) again with reference to this new circuit.
A copper wire of Length I is fashioned into a circular coil with N turns. When the magnetic field through the coil changes with time, for what value of N is the induced emf a maximum?
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