Purchase Solution

A coaxial cable consists of a wire of radius 'a' surrounded by a concentric conducting sleeve of inner radius 'b' and outer radius 'c'.

Not what you're looking for?

Ask Custom Question

A coaxial cable consists of a wire of radius 'a' surrounded by a concentric conducting sleeve of inner radius 'b' and outer radius 'c'.

A current flows in the wire of radius 'a' out of the page; this current is spread uniformly over the cross section of the wire. An equal current flows in the opposite direction in the sleeve; this current is spread uniformily over the cross section of the sleeve.

1) find the magnetic field in the space between the wire and the sleeve; and also in the space outside the sleeve. (that is , find the mag field at a distance 'r' from the center of the wire when b<r<c and when r>c )

2)why is coax cable used in some applications? What are the physical characteristics that make its use desirable in some situations? (the answer to this part of the question may make use of the results for part [1]).

Attachments
Purchase this Solution
Solution Preview

1.)
<br>when b<r<c:
<br>let current in wire and the sleeve is i.
<br>because, current density in the sleeve = i/(pi*(c^2 - b^2))
<br>hence, the curren of the sleeve within the loop of radius r:
<br>i(r) = i*pi*(r^2 - b^2)/(pi*(c^2 - b^2))
<br>=> i(r) =i*(r^2 - b^2)/*(c^2 - b^2)
<br>
<br>Now, by Ampere's circuital law ...

Solution provided by:
Amrit Lal Ahuja, PhD (IP)
Education
  • BEng, Allahabad University, India
  • MSc , Pune University, India
  • PhD (IP), Pune University, India
Recent Feedback
  • " In question 2, you incorrectly add in the $3.00 dividend that was just paid to determine the value of the stock price using the dividend discount model. In question 4 response, it should have also been recognized that dividend discount models are not useful if any of the parameters used in the model are inaccurate. "
  • "feedback: fail to recognize the operating cash flow will not begin until the end of year 3."
  • "Answer was correct"
  • "Great thanks"
  • "Perfect solution..thank you"
Purchase this Solution
Free BrainMass Quizzes
Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.

The Moon

Test your knowledge of moon phases and movement.

Basic Physics

This quiz will test your knowledge about basic Physics.

Intro to the Physics Waves

Some short-answer questions involving the basic vocabulary of string, sound, and water waves.

Classical Mechanics

This quiz is designed to test and improve your knowledge on Classical Mechanics.

View More Free Quizzes
Related BrainMass Solutions

  • Ampere's law: Magnetic field due to a coaxial cable.

    53589 Ampere's Law: Magnetic Field Due to a Coaxial Cable A coaxial cable consists of a solid inner conductor of radius R1, surrounded by a concentric cylindrical tube of inner radius R2 and outer radius R3.

  • Source of Magnetic Fields

    121773 Source of Magnetic Fields A very long coaxial cable consists of an inner wire and a concentric outer cylindrical conducting shell of radius R. At one end, the wire is connected to the shell.

  • Electrostatics: Charge density in a coaxial cable.

    224378 Electrostatics: Charge density in a coaxial cable. We have a long coaxial cable with an inner solid wire of radius a and outer metal shell of radius b. On the inner wire, the volume charge density is given by ks2 .

  • Acceleration of Gravity/Divergence Theorem

    The mass distribution consists of an infinitely long "wire" of radius a running along the z axis, surrounded by empty space then by a hollow cylinder with inner radius b and outer radius c, also centered on the z axis.

  • Electric field due to coaxial cable

    202053 Electric field due to coaxial cable A long coaxial cable consists of an inner cylindrical conductor with radius a and an outer coaxial cylinder with inner radius b and outer radius c.

  • Electrical Fields in Spheres

    2) A metal sphere of radius R, carrying charge q, is surrounded by a thick concentric metal shell (inner radius a, outer radius b). The shell carries no net charge. (a) Find the surface charge density σ at R, at a, and at b.

  • Magnetic Field of Coaxial Cable

    207147 Magnetic Field of Coaxial Cable A solid conductor with radius a is supported by insulating disks on the axis of a conducting tube with inner radius b and outer radius c.

  • Solid Conducting Core- Electric And Potential Fields

    (solid conducting core) Consider a concentric spherical system made up of the following parts: A solid conducting core radius a with total charge Qc , surrounded by a conducting shell of inner radius b and outer radius c.

  • Electrostatics: Capacitance of a spherical capacitor.

    Finding radius of outer shell A spherical capacitor is formed from two concentric, spherical, conducting shells separated by vacuum. The inner sphere has radius 15.0 cm, and the capacitance is 116 pF. 1.) What is the radius of the outer sphere?

View More Related Solutions