1. What is proportional to the magnitude of the induced emf in the circuit? A. Rate of change of voltage B. Rate of change of magnetic flux C. Rate of change of resistance offered D. Rate of change of current in the circuit. 2. An induced e.m.f. is produced when a magnet is plunged into a coil. The magnitude of the induced e.m.f. is independent of A. number of turns of coil B. the strength of the magnet C. the resistivity of the wire of the coil D. speed with which the magnet is moved 3. A coil of insulated wire is connected to a battery. If it is taken to galvanometer, its pointer is deflected, because A. the coil acts like a magnet B. the induced current is produced C. the number of turns in the coil of the galvanometer are changed D. none of these

1. What is proportional to the magnitude of the induced emf in the circuit? A. Rate of change of voltage B. Rate of change of magnetic flux C. Rate of change of resistance offered D. Rate of change of current in the circuit. 2. An induced e.m.f. is produced when a magnet is plunged into a coil. The magnitude of the induced e.m.f. is independent of A. number of turns of coil B. the strength of the magnet C. the resistivity of the wire of the coil D. speed with which the magnet is moved 3. A coil of insulated wire is connected to a battery. If it is taken to galvanometer, its pointer is deflected, because A. the coil acts like a magnet B. the induced current is produced C. the number of turns in the coil of the galvanometer are changed D. none of these

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter20: Induced Voltages And Inductance

Section: Chapter Questions

Problem 28P: An astronaut is connected to her spacecraft by a 25-m-long tether cord as she and the spacecraft...

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An astronaut is connected to her spacecraft by a 25-m-long tether cord as she and the spacecraft orbit Earth in a circular path at a speed of 3.0 105 m/s. At one instant, the voltage measured between the ends of a wire embedded in the cord is measured to be 0.45 V. Assume the long dimension of the cord is perpendicular to the vertical component of Earths magnetic field at that instant. (a) What is the magnitude of the vertical component of Earths field at this location? (b) Does the measured voltage change as the system moves from one location to another? Explain.
(a) An MRI technician moves his hand from a region of very low magnetic field strength into an MRI scanner's 2.00 T field with his fingers pointing in the direction of the field. Find the average emf induced in his wedding ling, given its diameter is 2.20 cm and assuming it takes 0.250 s to move it into the field. (b) Discuss whether this current would significantly change the temperature of the ring.
An astronaut is connected to her spacecraft by a 25-m-long tether cord as she and the spacecraft orbit Earth in a circular path at a speed of 3.0 105 m/s. At one instant, the voltage measured between the ends of a wire embedded in the cord is measured to be 0.45 V. Assume the long dimension of the cord is perpendicular to the vertical component of Earths magnetic field at that instant. (a) What is the magnitude of the vertical component of Earths field at this location? (b) Does the measured voltage change as the system moves from one location to another? Explain.