Coaxial Definition and 176 Threads

Homework Statement Compare sound waves to waves in coaxial cables a.k.a. T.E.M. I really have no idea how to answer this question. I've been researching and researching, and so far i can't find any information about WAVES for coaxial cables. Any help? Thanks. Homework Equations...

Homework Statement http://smg.photobucket.com/albums/v68/jumpboyb/?action=view&current=scan0001.jpg" Pretty much looking for a general equation for capacitance of a coaxial cable per meter length. given: -a diagram (click link) -two radii -dielectric material -outer conductor is...

Homework Statement A coaxial cable consists of two very long cylindrical tubes, separated by linear insulating material of magnetic susceptibility χm (see Figure). A current I flows down the inner conductor and returns along the outer one, in each case the current distributes itself...

Homework Statement a coaxial cable carries current as follows: (see attachment) at point P, 0.3 meters from the central axis, the magnetic field is 0.005 Teslas, what is current, I? Homework Equations magnetic field solenoid, B = mu_0(n)I where mu_) is constant = 4pi*10^-7, n is...

Homework Statement If anyone could clarify this statement for me, I'm having a bit of difficulty interpreting what the heck I'm supposed to do: "For a given potential difference V0 between the inner and outer conductors and for a given fixed value of b, determine the inner radius a for which...

Hi, I am doing an experiment with a coaxial cable and i want to Count out it expected RC-constant for the cable. I have measured the resistance for the cable, but when i count the RC, the resistansen that will be used only is the half of it resistans measured in the beginning. Why...

Homework Statement A long metal cylinder with radius a is supported on an insulating stand on the axis of a long, hollow metal tube with radius b. Thew positive charge per unit length on the inner cylinder is \lambda, and there is an equal negative charge per unit length on the outer cylinder...

Homework Statement A coaxial conductor has the length L. The inner conductor of radius a carries a current I in the z direction. The outer conductor is very thin and has the radius b. Calculate the total magnetic flux enclosed within the conductors. Homework Equations Magnetic flux...

Homework Statement Two coaxial cylindrical conductors are shown. The inner cylinder has radius a = 2 cm, length 10 m, and carries a total charge of Q inner = +8nC. The outer cylinder has an inner radius b = 6 cm, outer radius c= 7 cm, length 10 m, and carries a total charge of Q outer =...

Homework Statement What would the equipotential or e-field lines look like when staring down the axis of the two finite cylinders? Will the E-field lines be radial or are they different because the cylinders aren't infinite?

Hi, As you know the capacitance per unit length of a standard coaxial cable is C_{coax} = \frac{2 \pi \varepsilon_{0} \varepsilon_{r}}{\ln{\frac{b}{a}}} where b is the radius of the cable and a is radius of the central conductor. . If we only want to know the capacitance of a...

Homework Statement "A coaxial cable consists of an inner wire and a concentric cylindrical outer conductor. If the conductors carry equal but opposite charges, show that there is no net charge on the outside of the outer conductor. Homework Equations Gauss's Law The Attempt at a...

Homework Statement GIVEN: a=radius of inner electrode = 0.05 cm b=radius of outer electrode = 0.5 cm Vo = 130 V QUESTION: What is the electric field at surface of the inner electrode in units of V/m? Homework Equations Given equations Potential at radius r b/w inner&outer electrodes...

hiya guys, I'm having a large amount of trouble with a problem that I've been working through (currently revising for an uncoming exam in electromagnetism, along with a lot of other things). the problem is stated as follows (condensed): coaxial cable - inner cylinder radius a, out cylinder...

Homework Statement Consider a coaxial capacitor. If the inner radius is 5mm, the length is 3 cm, and the voltage rating of the capacitor is 2kV, what is the maximum capacitance if the dielectric between the two conductors is 2.3, and E breakdown is 15MV/m. Homework Equations E_r =...

Why is the coaxial cable impedance independent of it's length? I am considering the model shown in the attached picture. Since the resistance, capacitance and inductance are all dependent of the length of the cable in one way or another how come the impedance is not? I also can't find any...

Homework Statement I have to find the magnetic vector potential in a round coaxial cable. The internal conductor has a finite (known) conductivity. The external conductor is a perfect electrical conductor. Both the radius of the internal and the external conductors are known. I have to assume...

A) By definition linear charge density is Q/L. So for the inner conductor with 2λ I want to say it is 2Q/infinity but this cannot be right. I am sure using Guass's law produces a correct answer but I cannot see anyway to relate it to λ or length of the conductors for that matter B) For...

Two coaxial cylinders, inner radius a and outer radius b are separated by a material of conductivity given by \sigma (r) = k/r for some constant 'k'. Find the resistance between the cylinders. Here the conductivity is a function of position and the charge density is not zero in the resistive...

This one is from Griffiths. Two coaxial long solenoids each carry current I, but in opposite directions. The inner solenoid has radius 'a' and has 'n1' turns per unit length. The outer solenoid has radius 'b' and has 'n2' turns per unit length. Find the magnetic field \vec B in three...

I thought people helped on this forum? If anything is unclear just ask, I'm checking for posts every minute. Come on people I have to get this done by 5 pm. I've gotten a little further. I believe it has something to do with mutual inductance. A metal ring (no current) is brought close to a...

i have attached a doc file. it shows two coaxial circular bars of different material and a force(30kn) is applied in the top. I think the internal forces in both the bars will be 30kn. Am i correct. bar1 is made of steel and bar 2 of aluminium. the total length of the structure is 10metres.

The figure below is a cross-sectional view of a coaxial cable. The center conductor is surrounded by a rubber layer, which is surrounded by an outer conductor, which is surrounded by another rubber layer. In a particular application, the current in the inner conductor is 1.86 A out of the page...

Hello all, I once wanted to plug two coaxial cables together (tv - antenna), and when I touched the coaxial cable coming from the antenna, I got an electric shock (a weak one, like if you get an electric shock if you are charged and touch metal). My questions: 1) Why did I get an...

Maybe you, chemical people could answer my question. Imagine a fuel injector surrounded by a coaxial air stream. The fuel and air flow are parallel, coaxial and axisymmetric. Both fluids obey ideal gas equation. Let's consider steady and compressible flow, i.e, variations of \rho are...

why we should use the pulse function in function generator when we need to check the speed of electromagnetic wave in coaxial line ?? why we can't use the other like sawtooth function??