(e) Examine the coil diagram in Figure 4.4. (i) Explain how the flux density B in the core can be changed without altering the core's or the coil's physical characteristics such as structure, number of turns, or material properties. (ii) Now suppose that Vin was originally 10V but suddenly changes to 20V at to, i.c.. there is a source voltage step change at to. What will happen to the voltage and to the magnetic flux in the coil at to and right after to, respectively? Explain your answer, including a brief discussion of Lenz's and Faraday's law as well as how (or whether) these laws determine what will happen to the coil's voltage and magnetic flux. Assume that the coil has no winding resistance or capacitance. Adjustable DC source 4002 www 0.25A Coil Figure 4.4 Core

(e) Examine the coil diagram in Figure 4.4. (i) Explain how the flux density B in the core can be changed without altering the core's or the coil's physical characteristics such as structure, number of turns, or material properties. (ii) Now suppose that Vin was originally 10V but suddenly changes to 20V at to, i.c.. there is a source voltage step change at to. What will happen to the voltage and to the magnetic flux in the coil at to and right after to, respectively? Explain your answer, including a brief discussion of Lenz's and Faraday's law as well as how (or whether) these laws determine what will happen to the coil's voltage and magnetic flux. Assume that the coil has no winding resistance or capacitance. Adjustable DC source 4002 www 0.25A Coil Figure 4.4 Core

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter8: Electromagnetism And Em Waves

Section: Chapter Questions

Problem 37Q

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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

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(e) Examine the coil diagram in Figure 4.4.
(i)
Explain how the flux density B in the core can be changed without altering the
core's or the coil's physical characteristics such as structure, number of turns, or
material properties.
(ii) Now suppose that Vin was originally 10V but suddenly changes to 20V at to, i.e.,
there is a source voltage step change at to. What will happen to the voltage and to
the magnetic flux in the coil at to and right after to. respectively?
Explain your answer, including a brief discussion of Lenz's and Faraday's law as
well as how (or whether) these laws determine what will happen to the coil's
voltage and magnetic flux. Assume that the coil has no winding resistance or
capacitance.
Adjustable
DC source
4092
www
0.25A
Coil
Figure 4.4
Core

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