The unit of magnetic flux is named for Wilhelm Weber. A practical-size unit of magnetic field is named for Johann Karl Friedrich Gauss. Along with their individual accomplishments, Weber and Gauss built a telegraph in 1833 that consisted of a battery and switch, at one end of a transmission line 3 km long, operating an electromagnet at the other end. Suppose their transmission line was as diagrammed in the figure below. Two long, parallel wires, each having a mass per unit length of 49.5 g/m, are supported in a horizontal plane by strings l = 5.95 cm long. When both wires carry the same current I, the wires repel each other so that the angle between the supporting strings is 0 = 15.4°. (a) Are the currents in the same direction or in opposite directions? O the same direction O opposite directions (b) Find the magnitude of the current. A (c) If this transmission line were taken to Mars, would the current required to separate the wires by the same angle be larger or smaller than that required Earth? O larger O smaller Why?

The unit of magnetic flux is named for Wilhelm Weber. A practical-size unit of magnetic field is named for Johann Karl Friedrich Gauss. Along with their individual accomplishments, Weber and Gauss built a telegraph in 1833 that consisted of a battery and switch, at one end of a transmission line 3 km long, operating an electromagnet at the other end. Suppose their transmission line was as diagrammed in the figure below. Two long, parallel wires, each having a mass per unit length of 49.5 g/m, are supported in a horizontal plane by strings l = 5.95 cm long. When both wires carry the same current I, the wires repel each other so that the angle between the supporting strings is 0 = 15.4°. (a) Are the currents in the same direction or in opposite directions? O the same direction O opposite directions (b) Find the magnitude of the current. A (c) If this transmission line were taken to Mars, would the current required to separate the wires by the same angle be larger or smaller than that required Earth? O larger O smaller Why?

Physics for Scientists and Engineers with Modern Physics

10th Edition

ISBN:9781337553292

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter29: Sources Of The Magnetic Field

Section: Chapter Questions

Problem 17P

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Concept explainers

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

The unit of magnetic flux is named for Wilhelm Weber. A practical-size unit of magnetic field is named for Johann Karl Friedrich Gauss. Along with their individual
accomplishments, Weber and Gauss built a telegraph in 1833 that consisted of a battery and switch, at one end of a transmission line 3 km long, operating an
electromagnet at the other end. Suppose their transmission line was as diagrammed in the figure below. Two long, parallel wires, each having a mass per unit
length of 49.5 g/m, are supported in a horizontal plane by strings e = 5.95 cm long. When both wires carry the same current I, the wires repel each other so that
the angle between the supporting strings is 0 = 15.4°.
(a) Are the currents in the same direction or in opposite directions?
O the same direction
O opposite directions
(b) Find the magnitude of the current.
A
(c) If this transmission line were taken to Mars, would the current required to separate the wires by the same angle be larger or smaller than that required
on the Earth?
O larger
O smaller
Why?

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