Conducting Definition and 533 Threads

Homework Statement The picture of the problem can be found here: http://www.2shared.com/photo/U_JIkDks/Capture.html The questions that I'm having trouble with are: (a) The magnitudes of the charge densities on the inner and outer shells are now changed (keeping λinner = -λouter) so that...

Homework Statement I'm supposed to find the time taken for the disk to slow down from ω0 to (1/2)ω0...Here's what I've done: Since on each side of the disk there is current flowing into the centre, each side experiences a force F, so the net torque on the system = 2Fa. Then I can find...

Homework Statement See figure attached. Homework Equations The Attempt at a Solution Originally I have solved this problem using Gauss's law by defining a gaussian surface in the form of a cylinder around the floating cylinder to get the electric field distribution underneath...

Homework Statement A point charge +q is situated a distance a from the center of a grounded conducting sphere of radius R. Find the induced surface charge on the sphere as a function of θ. Integrate this to get the total induced charge.Homework Equations σ=-εo*∂V/∂r Q=∫σ daThe Attempt at a...

Homework Statement An infinite sheet of charge is located in the y-z plane at x = 0 and has uniform charge denisity σ1 = 0.3 μC/m2. Another infinite sheet of charge with uniform charge density σ2 = -0.33 μC/m2 is located at x = c = 21.0 cm.. An uncharged infinite conducting slab is placed...

Homework Statement You have two identical tiny conducting spheres: sphere A carries positive charge qA, and sphere B carries negative charge qB. First the spheres are placed distance d = 0.404 m apart, and they attract each other with a force F1 = 0.748 N. Then the spheres are brought...

Homework Statement Two coaxial cylindrical conductors are shown in perspective and cross-section above. The inner cylinder has radius a = 2.0 cm, length L = 10.0 m and carries a total charge of Qinner = + 8.0 nC (1 nC = 10-9 C). The outer cylinder has an inner radius b = 6.0 cm, outer radius c...

If we have two parallel conducting plates ( of surfaces 1msq each), set at a very small distance apart, so that the plates can be considered like infinite plates (no edge effect). Both plates are neutral at first. Now a charge (say +Q) is placed on one of the plates. the other still is...

Can an electron conduct heat? I know electrons are partially the reason why metals conduct heat, but can an electron itself conduct heat? In other words, does an electron have a heat capacity?

Homework Statement On the XY plane there exist two concentric, thin, conducting shells, centered at the origin; one is of radius R, the other of 2R. They are connected. There exists a point charge at (0, 1.5R). What is the potential at some point outside the outer ring?Homework Equations I...

Homework Statement The figure (found here) shows a cross-sectional view of two concentric, infinite length, conducting cylindrical shells. The inner shell has as an inner radius of a and an outer radius of b. The electric field just outside the inner shell has magnitude E0 and points radially...

Hi there, I'm trying to create a BPM (beats per minute) calculation with virtual conducting, having taken coordinates from the Kinect's system. The idea behind it is that the Kinect will record coordinates from the movements of the hand gestures and calculate average velocities of the first...

Homework Statement panofsky 10.3 Find the torque on a solid conducting cylinder rotating slowly in a uniform magnetic field perpendicular to the axis of the cylinder. The Attempt at a Solution let the radius of cylinder r, and the conductivity is σ, the rotating angular...

The electric field strength inside a conducting charged sphere is zero, but why? In the book it says "that the field lines would link charges of opposite sign in the sphere and such a state of affairs is impossible under static conditions in a conductor." I don't really get this sentence. And...

Homework Statement A +30mC point charge sits at the center of a spherical thick metal shell, of 4.0cm inner radius, and 2.0cm thickness. The net charge on the shell is -50mC. Homework Equations The Attempt at a Solution I came up with several conclusions and I'm not really sure...

I feel like I need to incorporate ##\mathbf{E} = E\hat{\mathbf{z}}## but I don't know what to do with it. A grounded conducting sphere of radius ##a## is placed in an (effectively) infinite uniform electric field ##\mathbf{E} = E\hat{\mathbf{z}}##. The potential for a uniform electric field in...

If I have a +5 nC charge on the inside of the shell, the inside surface would be -5nC, the outside would be +5 nC and between those surfaces there would a 0 charge, right? So just to make sure I have it all straight, the INSIDE of the shell would actually be 0 because the INNER SURFACE is -5...

Homework Statement (1)A conducting sphere w/ charge +Q is surrounded by a spherical conducting shell. What is net charge on inner surface of the shell? (2) A charge is placed outside the shell. What is the net charge on the inner surface now? (3) What if the shell and sphere are not...

Homework Statement This is a lab question. Basically what the lab entails is we have two spheres. One is suspended from a string and another is attached to a non-conducting rod. We inductively charge the sphere attached to the rod. Then we bring it close to the other sphere that is being...

We just went over Faraday's law in class and our teacher stressed how a changing flux is needed to induce an emf in some coil/loop/wire. I was just wondering then, how is an emf induced in a straight conducting wire moving at a constant velocity in a constant magnetic field? It seems as if...

I want to find the potential of a conducting disk in space whithout laplace equation.(i know how to do that).I want to use the potential of a uniformly charged rod.because its equipotentials are ellipsoids(ellipses rotated around the rod).now a disk is a limiting case of an ellipsoid. I can't...

[b]1. A solid sphere of radius a = 12.8 cm is concentric with a spherical conducting shell of inner radius b = 37.1 cm and outer radius c = 39.1 cm. The sphere has a net uniform charge q1 = 9.00×10-6 C. The shell has a net charge q2 = -q1. Find expressions for the electric field, as a function...

Homework Statement Attached Homework Equations The Attempt at a Solution Shouldn't it be double this answer?

Why is it that when you have an insulator, the charges are uniformly distributed but in a conductor, the charges are only at the surface?

Is the relation v_{\varphi }v_{g}=v^{2}=\frac{1}{\mu \varepsilon } always true in a plasma ? Where v_{\varphi }, v_{g} are respectively the phase and group velocity of the electromagnetic wave that is propagating in the plasma.

1. In the arrangement shown, a conducting bar of negligible resistance slides along horizontal, parallel, frictionless conducting rails connected as shown to a 4.0-Ω resistor. A uniform 2.5-T magnetic field makes an angle of 30° with the plane of the paper. If L = 80 cm and the mass of the...

Homework Statement I have a magnetic ball with magnetization M, mass m and radius R that starts to fall from rest through conducting tube of radius a little big larger than R, thickness \Delta and conductivity \sigma. The ball is not rotating, it said that magnetization is oriented vertically...

I'm trying to find the resistivity of conducting putty at room temperature and I've been looking all over google with no success. There isn't really anything more I can do to work it out so I'm wondering if anyone here knows. Thanks :)

Homework Statement A conducting wire runs directly over a horizontal compass in the north-south direction. When a current of magnitude I passes through the wire, the compass needle swings 20° to the west and stays in that position. When a current of 2I passes through the wire, the compass...

how to proof that the electric fielf inside a conducting shell is zero ? i don't want to solve it using gauss law and not through practically taking example but i wanted to solve it through vector by finding the resultant zero at any point? please explain?

Hello, I have puzzled myself with a question: what is the potential of a conducting rod in a homogeneous electric field (net rod charge = 0)? To be more exact I imagine a conducting rod suspended on a non-conducting thread in the Earth electric field near and perpendicular to its surface. If...

If I have a conducting wire of length l and a charge separation develops between one end of the wire and the other, will the electric field have a magnitude is equal to: V/l (voltage/length of wire)??

This problem is driving me mad suppose that we have a positive charge inside a non conducting spherical shell uniformly charged the charge is at a random place inside the shell but not in the center the textbook says the charge will feel no force from the charges of the shell and the...

Homework Statement A conducting sphere of radius R2 has a central cavity of radius R1 that holds a charge q in its centre. Determine the electrical field for r > R2, r < R1 and R1 < r < R2 and determine the charge density induced by q. I'm not allowed to include a link to my figure, but I'm...

Hello, I have simulated AC electric field in multiple (in fact 3) media with COMSOL, a multiphysic solver. The simulation took place with different frequencies of applied electric potential. Media have different conductivities. At lower frequencies, every thing is ok, I mean, electric...

If a point charge is placed in a cavity of a conducting sphere, and the sphere itself is given a charge , would the point charge in the cavity experience a force?

Homework Statement Figure 22-42 shows two parallel nonconducting rings with their central axes along a common line. Ring 1 has uniform charge q1 and radius R; ring 2 has uniform charge q2 and the same radius R. The rings are separated by a distance 3.00R. The ratio of the electric field...

Why when two charged conductors connected by a conducting wire gain the same potential . Lets say we have two spheres of different charges why when we connect them by a single copper wire they gain the same potential Thanks in advance

Homework Statement A spherical conducting shell of radius 0.1 m has a free charge of -2 μC. It is surrounded by a concentric spherical conducting shell of radius 0.12 m carrying a free charge of -2 μC. Between the shells is a dielectric material of dielectric constant 10 εo. If the dielectric...

Homework Statement A conducting rod of length l moves with a constant speed v perpendicular to an infinately long, straight wire carrying a current I. What is the emf generated between the ends of the rod when it is a perpendicular distance r from the wire? Homework Equations no idea...

I'm not 100% confident in my reasoning for this question because my answer seems unlikely: Homework Statement A spherical capacitor comprises two thin metal spheres of different radii but with a common centre. The following series of operations is completed: The spheres are mutually...

In a conductor suspended in an external electric field, in a vacuum, what holds the conducting electrons inside the conductor? Why don't they just fly off into space, under the influence of the field? If they are free enough to move between the atoms of the conductor, this means the force from...

If we place an infinite conducting sheet in free space, and fix its potential to \varphi_0, how do we solve solve for the potential on either side of the sheet? Since the potential blows up at infinity, it seems impossible to define boundary conditions.

Homework Statement The electric potential at the center of a (5.00cm radius) metallic sphere is zero Volts. The sphere is surrounded by a concentric conducting shell of 10.0cm outer radius and a thickness of 2.0cm. The shell has a net charge of +20mC. a.)Find the charge on the sphere. b.)Give...

A very, large, thin conducting plate lies in the x-y plane. The plate carries a current in the y direction. The current is uniformly distributed over the plate with σ amperes flowing across each meter of length perpendicular to the current. Use Ampere's Law to find the magnetic field at some...

I have a question regarding a conducting loop of radius r in a changing magnetic field B. I understand and can determine the direction of the induced current which implies the existing of an electric field that is tangential to the loop. Since this is a closed loop, I am having trouble...

Salt water and tap water conducting electricity - help appreciated :) Hello, Thanks in advance for helping me with my question! I'm so excited to find this physics forum of such talented people. My question is, I know that salt water conducts electricity more than tap water due to the ions...

When an induced emf is created in a conducting rod why is the resulting potential higher at the positive end of the rod? Since the electrons accumulate at the negative end of the rod then wouldn't this be the higher potential instead? Don't negative charges flow from lower to higher potential?

A hollow, conducting sphere is initially uncharged. A positive charge, +q1, is placed inside the sphere (at the center). Then, a second positive charge, +q2, is placed near the sphere but outside it. Which of the following statements describes the net electric force on each charge? 1-There...

Homework Statement There is a region of space containing a uniform electric field of strength E. A neutral conducting cube with side length s is placed into this field. The cube is aligned with the field. You may assume that the electric field outside the cube is unaffected by any changes that...