
(a)
Find the expression for magnitudes of the magnetic field in each of the four layers.
(a)

Answer to Problem 27PQ
The expression for magnitudes of the magnetic field in each of the four layers are
Explanation of Solution
Write the expression for Ampere’s Law for the area bounded by the curve as.
Rearrange above equation for
Here,
Write the expression for current density as.
Here,
Write the expression for area of the circle as.
Substitute
Consider that the inner coaxial cable of radius
Write the expression for Amperian loop current as.
Substitute
Write the expression for Amperian loop is the circumferences of the circle as.
Substitute
Rearrange the above equation as.
Thus, the magnitude of the magnetic field in inner layer
Consider the inside insulator coaxial
The current in the loop is product of current density and area of loop is
The length of Ameprian loop is equal to the circumferences of the circle that is
Substitute
Thus, the magnitude of the magnetic field in inside insulator layer is
Consider the outer coaxial of radius
Write the current density of the layer
Substitute
Write the expression for Amperian loop current as.
Substitute
Substitute
Here,
Thus, the magnetic field on the third layer is
Write the expression for net magnetic field at the layer
Substitute
The net current enclosed inside the coaxial cable is zero.
Thus, the magnitude of the magnetic field outside the insulator layer is zero that is
Conclusion:
Thus, the expression for magnitudes of the magnetic field in each of the four layers are
(b)
Compare the part a results with the magnetic field produced by a long, straight wire and explain the advantage of using a coax.
(b)

Answer to Problem 27PQ
The expression for magnitude of the magnetic field for long straight current carrying wire is equal to the magnitude of the magnetic field in inside insulator layer.
Explanation of Solution
Write the expression for the magnetic field strength (magnitude) produced by a long straight current-carrying wire as.
The expression for long straight current carrying wire is equal to the magnitude of the magnetic field in inside insulator layer.
The advantage of using of coaxial cable as:
- 1. The inner conductor is in a Faraday shield, noise immunity is improved, and coax has lower error rates and therefore slightly better performance than twisted-pair.
- 2. Coax provides sufficient frequency range to support multiple channel, which allows for much greater throughput.
- 3. It also provides greater spacing between amplifiers coax's cable shielding reduces noise and crosstalk
Conclusion:
Thus, the expression for magnitude of the magnetic field for long straight current carrying wire is equal to the magnitude of the magnetic field in inside insulator layer.
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Chapter 31 Solutions
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