Conducting Definition and 533 Threads

  1. B

    Charge Density of a Conducting Disc

    Oh since this got moved: It's not for any course or class so I'm not following any book. I'm not sure if anyone will be able to answer this but I'll ask anyway: I've solved laplaces equation in cyclindrical coordinates for a disc of radius 'a' and constant potential V on the disk (disc in z=0...
  2. P

    Intensity of EM waves in a conducting medium

    I'm attempting to calculate the above, but I'm stuck. What I have thus far: intensity is the time average of the poynting vector, where the poynting vector is the cross product of the E and B fields. Using the given expressions, I get: \frac{\sqrt{a^2 + b^2}}{\mu \omega} E_0^2 \exp(-2bz)...
  3. S

    Why Is the Potential Zero on the Surface of a Conducting Sphere in an E-Field?

    I've solved an electrostatics problem where we have to find the surface charge density on a conducting sphere in a previously uniform E-Field, but I had to assume that V=0 on the surface of the cylinder, and I'm not sure why this is the case. I know that E=0 inside, so the potential should be...
  4. L

    Calculating Capacitance of Two Isolated Conducting Spheres

    The question is the following one: Two isolated conducting spheres of equal radius have charges +Q (#1)and -Q (#2) respectively. If they are separated by a large distance compared to their radius, what is the capacitance of this unusual capacitor? The first remark :wink: : C= \frac{Q}{V}...
  5. X

    Magnetic monopole induces current in perfect conducting ring

    I am trying to calculate the current induced in a loop assuming a magnetic monopole exists. The loop is a perfect conductor, which I understand implies the electric field inside must be zero. I picture the problem with the magnetic monopole traveling with a velocity coaxial with the loop. I am...
  6. L

    Comparing an infinite grounded conducting plate to a system of point charges

    A point charge q is a distance d from a grounded conducting plate of infinite extent (figure a). For this configuration the potential V is zero, both at all points infinitely far from the particle in all directions and at all points on the conducting plate. Consider a set of coordinate axes with...
  7. L

    Little question on the potential in a conducting spherical shell

    The question is: A conducting spherical shell of inner radius b and outer radius c is concentric with a small metal sphere of radius a < b. The metal sphere has a positive charge Q. The total charge on the conducting spherical shell is –Q. What is the potential of the metal sphere? I...
  8. B

    Calculating Charge Distribution on Isolated Conducting Spheres

    The question i am stuck on and am unable to find anything in my notes about (although i can't find my notes from tuesday however we seem to have covered the topic on friday and maybe just not finished it off in time) is ... Two isolated spherical conductors one with radius R and one with...
  9. Reshma

    What Condition Must q2 Meet to Experience a Repelling Force?

    A grounded sphere of radius 'a' is placed between point charges q1 and q2 with its centre O lying on the straight line joining q1 and q2. The distances of q1 and q2 from O are 2a and 4a respectively. Find the condition that the charge q2 experiences a repelling force. My question: How do I...
  10. K

    Magnatice field, moving rantangle conducting rod, incline plane

    Imagina an incline plane of angle @. A rod of length L, is at rest( becasuse you are holding it) at the very top of the incline. A magnatice field is pointing up in your mental picture. Find the velocity v of the rod as a function of time once your let go of the rod. Two things in the problem...
  11. S

    What is the electric field around a conducting sphere?

    Hi all, I am having some troubles with some Electromagnetism questions. First of all can someone please explain the basics behind Electric fields. The question asks "What is the electric field around a conducting sphere of radius R carrying a charge Q". Does this imply that because the sphere...
  12. T

    Charged conducting sphere in a uniform electric field?

    Hello, I've been working my way through Griffiths' "Introduction to Electrodynamics" book, and I'm slightly confused by Problem 3.20. For those of you without a copy of this book, given a conducting sphere of radius R and charge Q in a uniform electric field of strength E0, what is the...
  13. S

    Why Do Charges Distribute Evenly on Conducting Plates and Spherical Conductors?

    why do the excess changes of a thin infinite conducting plates spread out evenly on the two faces? Is that just a way to minimize charge repulsion?
  14. S

    Why Is My Electric Field Calculation for a Conducting Shell Incorrect?

    Consider a thin spherical shell of radius 14.5 cm with a total charge of +39.1 micro coulombs distributed uniformly on its surface. (Take radially outward as the positive direction.) (b) Find the electric field 39.6 cm from the center of the charge distribution. Round your answer to three...
  15. G

    What Equations are Required for Evaluating Resistance in Electromagnetic Propulsion?

    Hi gang, Here is an easy one but nevertheless requires formula to express your postion. in terms of magnetic propulsion; I am building a tunnel with r=5cm and a sphere inserted will be approx 8cm diameter which will be propelled via electro magnetic propulsion. I'm now about to evaluate...
  16. H

    Electric Potential of Conducting Shell: R1 & R2, Q at Centre

    In a conducting shell,with inner radius R1 and outer radius R2,and with charge Q at the centre,the Potential at surface is (kQ/R2),Why it is not (KQ/R1)?? :confused:
  17. T

    How Is Charge Distributed on a Conducting Shell with a Central Charge?

    I need a little help with this problem. Its from the 2004 physics bowl. 50. A solid spherical conducting shell has inner radius a and outer radius 2a. At the center of the shell is located a point charge +Q. What must the excess charge on the shell be in order for the charge density on the...
  18. A

    Isolated charged conducting sphere problem

    Hi, i appreciate your help. The problem reads an isolated charged conducting sphere with radius 12cm creates an electrical fiels of 4.90^4 21cm away from the center. find the capacitance and charge density? I used the formula C= (a*b)/(Ke*(b-a)) but i get the wrong answer what am i...
  19. A

    Gauss's Law and a conducting sphere

    "A solid conducting sphere with radius R carries a posative total charge Q. The sphere is surrounded by an insulating shell with inner radius R and outer radius 2R. The insulating shell has a uniform charge density \rho a) find the value of \rho so that the net charge of the entire system is...
  20. G

    How to Determine Surface Charge Densities on a Conducting Cylinder?

    An infinitely lond cylindrical conductor of inner radius "a" and outer radius "b" initially has a positive surface charge density of \sigma_{o} on its outer surface. A wire of positive charge per unit length \lambda is then placed on the axis of the cylinder. Find the final surface...
  21. D

    How Does Charge Distribution Affect Fields and Energy in Nested Conductors?

    Here's the problem that I have been trying to solve: A solid conducting sphere of radius 20cm is concentrically placed inside a spherical shell of inner radius 30 cm and outer radius 40cm. A Charge of 20uC is placed on the inner sphere, and a charge of -10uC is placed on the outer conductor...
  22. G

    Calculating Charge on Conducting Balls Hanging from Strings

    In the figure, two tiny conducting balls of identical mass m and identical charge q hang from nonconducting threads of length L. Assume that q is so small that tanq can be replaced by its approximate equal, sinq. First find an expression for x in terms of L, q, m, k and g. Then, given L...
  23. M

    Grounded conducting cylinder using Laplace

    Hi, I'm having trouble applying Laplace's equation solution in cylindrical coordinates to the problem of the grounded conducting cylinder of radius a in a uniform external field. The cylinder axis is the z axis, and the external electric field is E0 in the x direction. I need to find the...
  24. A

    Electromagnetic induction and conducting rods

    Two 0.68 m long conducting rods are rotating at the same speed in opposite directions, and both are perpendicular to a 4.7 T magnetic field. As the drawing shows, the ends of these rods come to within 1.0mm of each other as they rotate. More-over, the fixed ends about which the rods are rotating...
  25. C

    Conducting Electricity: No Wire Transfers?

    Is it possible to make electricity travel between 2 places with no wires?
  26. G

    Conducting sphere in a conducting spherical shell

    A conducting sphere that carries a total charge of 6 micro C is placed at the center of a conducting spherical shell that also carries a total charge of 6 micro C . (a) Determine the charge on the inner surface of the shell. (b) Determine the total charge on the outer surface of the shell...
  27. D

    Magnetism in infinite conducting slab

    "a conducting slab has infinite extent in the x and y directions and thickness L in the z direction. The slab is centered at z=0 and carries a uniform current density J=Ji where i, j, and k are unit vectors in the x, y, and z directiosn." -Find the magnetic field B at all points. -A square...
  28. Z

    Electricity, Conducting Plates and Magnetic Fields

    Howdie all, I'm soo glad I found this forum, people are genuinely working together instead of ignoring their fellow physics brethren =) A pair of square parallel conducting plates, having sides of length .05 meter, are .01 meter apart and are connected to a 200 volt power supply. An electron...
  29. A

    Question about Conducting Sphere

    In one of our exercises, there is a conducting sphere (S2) with a cavity inside (S1). A point charge is placed inside the cavity. We were told to try and find the electric field outside by following a set of steps. 1. Imagine that S2 is grounded. In that case, the charge on the cavity wall...
  30. S

    Calculating Magnetic Flux & EMF through a Conducting Loop

    A square conducting loop with sides a lies on a table a distance s from a very long straight wire carryinga current I. a) Derive an expression for the magnetic flux through the loop. b) Derive an expression for the EMF induced in the loop if it is pulled away in a direction orthogonal to...
  31. S

    Farday's law in two conducting loops

    consider two conducting loops with fixed geometries and at fixed positions. Let I1 and I2 be the currents flowing in the loops 1 and 2. how does Faraday's Law allow the currents I1 and I2 to affect each other? farday's law says that changing the flux between loops 1 will induce an emf in...
  32. P

    Most Conducting Metal + Roughest Surface: Find Out Now

    Does anybody know off of the top of their head: 1)The most conducting metal 2)A conducting metal with the roughest surface (looking for surface area) Paden Roder
  33. K

    How to find the electric field inside a conducting wire

    Yo, d00dz, I can't remember how to find the electric field inside a conducting wire (actually a coaxial cable) Here's the exact text of the problem: A coaxial cable (inner radius a, outer radius b) is used as a transmission line between a battery E and a resistor R, as shown in Fig 19...
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