One simple, though impractical, way to generate electrical power is shown below. A bar of metal with negligible resistance is in friction-less contact with two wires (also negligible resistance) spaced 15 cm apart. The changing magnetic flux generates an emf in the loop shown below. Zero-resistance wires Push |0.4 m/s 0.75 T

One simple, though impractical, way to generate electrical power is shown below. A bar of metal with negligible resistance is in friction-less contact with two wires (also negligible resistance) spaced 15 cm apart. The changing magnetic flux generates an emf in the loop shown below. Zero-resistance wires Push |0.4 m/s 0.75 T

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter13: Electromagnetic Induction

Section: Chapter Questions

Problem 91CP: A metal bar of mass m slides without friction over two rails a distance D apart in the region that...

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The conducting rod shown in the accompanying figure moves along parallel metal rails that are 25-cm apart. The system is in a uniform magnetic field of strength 0.75 T, which is directed into the page. The resistances of the rod and the rails are negligible, but the section PQ has a resistance of 0.25 . (a) What is the emf (including its sense) induced in the rod when it is moving to tire right with a speed of 5.0 m/s? (b) What force is required to keep the rod moving at this speed? (c) What is the rate at which work is done by this force? (d) What is the power dissipated in the resistor?
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Consider the system pictured in Figure P28.26. A 15.0-cm horizontal wire of mass 15.0 g is placed between two thin, vertical conductors, and a uniform magnetic field acts perpendicular to the page. The wire is free to move vertically without friction on the two vertical conductors. When a 5.00-A current is directed as shown in the figure, the horizontal wire moves upward at constant velocity in the presence of gravity. (a) What forces act on the horizontal wire, and (b) under what condition is the wire able to move upward at constant velocity? (c) Find the magnitude and direction of the minimum magnetic Field required to move the wire at constant speed. (d) What happens if the magnetic field exceeds this minimum value? Figure P28.26