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 First, what is the emf around this loop in mV to 2 significant digits?

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 First, what is the emf around this loop in mV to 2 significant digits?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter25: Electromagnetic Induction

Section25.1: Electric Current From Changing Magnetic Fields

Problem 3PP

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Magnetic Field Of Coaxial Cable

The word coaxial means same axis. So for a long straight cable to be coaxial, it must have concentric cylindrical shaped conductor around it. Coaxial cable (popularly called ‘coax’) has various applications ranging from current conductors to radiofrequency signal transmitters. This cable has lower emission losses and provides protection from electromagnetic interference which allows signals with less power to transmit over longer distances.For example, currents produced in the pickup of a stereo turntable generally travel to the amplifier through a coaxial cable.The self-inductance of a coaxial cable is another important characteristic, because it influences the propagation of electrical signals in the cable.

Question

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
First, what is the emf around this loop in mV to 2 significant digits?

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The magnetic field through a single loop of wire 12.0 cm in radius and of 7.5 Ω resistance changes with time as shown in the figure. Calculate the emf in the loop as a function of time.What is the emf at t = 1.0 s? For the sign take the loop in the plane of the paper, and the magnetic field out of the paper. Take clockwise to be positive emf. What is the emf at t = 3.0 s? What is the emf at t = 5.0 s? What is the current at t = 1.0 s?
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