Conducting Definition and 562 Threads

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?

Homework Statement Suppose we have an outer shell with charge -2Q and radius b. We also have an inner shell with charge Q and radius a. what is the potential when a<r<b. Homework Equations E=kQ/r^2 V=kQ/r E=-dV/dx The Attempt at a Solution The method I have been using according...

Homework Statement A conducting cylindrical pipe has an inner radius Ra and an outer radius Rb. a charge q is released inside it. Assume the length of a cylinder L>>Rb. Find the potential difference between the axis of the cylinder and outer surface. Homework Equations Vb-Va=-∫E*dl...

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 A long, cylindrical conductor of radius R carries a current I. The current density, J, is not uniform and is given by the equation J = br, where b is a constant. Find an expression for the magnetic field magnitude B at distance r < R and at distance r > R. Homework...

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...

Homework Statement Calculate the surface charge density on a thin insulated and uncharged cone, which has a point charge inside of it on the cone axis. Furthermore, calculate the force between the point charge and the cone. Homework Equations The relevant equation is the Poisson equation...

Homework Statement An infinitely long solid conducting cylindrical shell of radius a = 3.1 cm and negligible thickness is positioned with its symmetry axis along the z-axis as shown. The shell is charged, having a linear charge density λinner = -0.49 μC/m. Concentric with the shell is another...

Homework Statement I have attached the problem with a diagram. Homework Equations flux = EA = Qencl/εo The Attempt at a Solution I am confused about how I can find the charge densities on each surface. What I think is that the 5C will spread to both surfaces of plate one so...

Homework Statement An infinite sheet of charge is located in the y-z plane at x = 0 and has uniform charge denisity σ1 = 0.34 μC/m2. Another infinite sheet of charge with uniform charge density σ2 = -0.14 μC/m2 is located at x = c = 26 cm.. An uncharged infinite conducting slab is placed...

Homework Statement What is the difference between a uniform conducting sphere and a uniform non-conducting sphere? I'm studying the Gauss's Law right now.

Homework Statement A solid conducting sphere carrying charge q has radius a. What is the electric field when r<a. Homework Equations EA=Qenclosed/εo The Attempt at a Solution I found it using gauss law where Q=density*V. I ended up with qr/(4pi*a3*εo)HOWEVER, my friend told me it should be...

Homework Statement A conducting sphere of radius A has a charge +Q on it and is surrounded by an insulating material whose dielectric constant varies with radius according to εr = 2exp[-(r/a-1)]2. The dielectric has a spherical outer boundary B. Find the values of D, E, P, ρ as a function of...

Homework Statement A conducting wire has a resistivity, ρ as a function of its length, L, given by ρ=(ρ0)(L) where (ρ0) is constant. A is the cross-sectional area of the wire. the resistance of the wire would be A) [(ρ0)(L)]/A B) (ρ0)/(2A) C) [(ρ0)(L)]/(2A) D) [2(ρ0)(L^2)]/A E)...

Simple question,finding the charge on conducting sphere?? A conducting sphere of radius 1cm has a charge of 5microC is placed far away from another sphere with radius 2cm,,the two spheres are connected to each other by a thin wire ,the charge on the larger sphere is ? Answer : 3.33microC...

Suppose there are two conducting balls of the same radius and the balls are separated by some distance. If both balls are at the same nonzero potential and the potential at infinity is zero, does a closed form formula for the potential exist? Since I can't find the problem solved anywhere I...

Homework Statement Two square parallel sheets with area>>distance between them have total charges of Q1 and Q2 on them. What is the force between them? Homework Equations Q1in+Q2in=0 Q1in+Q1out=Q1 Q2in+Q2out=Q2 Q1out=Q2out The Attempt at a Solution I set up 4 equations for the...

Hello, I'm trying to find a calculator or an equation that would help me determine the total electrical resistance between two points (A and B) on the surface of several concentric conductive spherical shells. The inputs for the calculation are the radii of the shells: r1, r2, r2, their...

frankly i don't know much about anti-matter or super conductors...i just read an into-level topic on anti-matter and had a thought. the main concern while developing an energy source is that its feasibility should be considered...right? and the problem with anti-matter is that it takes too much...

I think understand the concept of the "method of images" to describe a conductor. The conductor has to be an equipotential or else electrons would be moving around inside it. This equipotential can be described by replacing the conductor with an image charge. For example imagine the field...

Hi, I tried to make some simulations of two conducting spheres in a constant electric field. The simulations seem to indicate that the electric field in the gap increases with increasing diameter of the spheres at a constant gap distance. Does this make sense? I expected just the reverse. What...

Homework Statement Two spherical conductors of radii r1 and r2 are separated by a distance much greater than the radius of either sphere. The spheres are connected by a conducting wire. The charges on the sphere are in equilibrium are q1 and q2 respectively, they are uniformly charged. Find...

Why is the Qenclosed zero if there's a charge inside the shell? Homework Statement A solid conducting sphere of radius a is placed inside a conducting shell which has an inner radius b and an outer radius c. There is a charge q1 on the sphere and a charge q2 on the shell. Find the...

Hi. I have this problem, which I must solve. It says: two concentric conducting spherical shells, of radius a and b (a<b), are charged at Q and -Q respectively. The space between the spheres is filled at its half by an hemisphere of dielectric with dielectric constante ε. a)Find the field for...

Homework Statement A uniformly polarized dielectric disk surrounded by air is lying at a conducting plane, as shown in the figure. The polarization vector in the is, \vec{P} = P \hat{k}, the disk radius is a, and the thickness d. Calculate the electric field intensity vector along the...

Homework Statement A uniformly polarized dielectric disk surrounded by air is lying at a conducting plane, as shown in Fig. 2.36. The polarization vector in the disk is, \vec{P} = P\hat{k}, the disk radius is a, and the thickness d. Calculate the electric field intensity vector along disk...

So this should probably go into math's section, but I feel you guys can give me the answer too, since this comes from an EE course(Theory of electromagnetic fields) http://pokit.org/get/2f3e7eef6b38bc75f0023b94976a2997.jpg(1) http://pokit.org/get/fc8658090d67ae0fafe79970021d1518.jpg(2)...

My professor said to in order to solve this, integrate the electric field to find the electric potential... \Delta V = -\int\stackrel{\rightarrow}{E}dl My question is, using Gauss's Law, (\oint E_{n}dA = \frac{Q}{\epsilon}), how do I go about finding Q? Isn't Q just the charge of the shell?

Homework Statement Two uncharged conductors A and B are of different sizes. They are charged as follows: 1. A is charged via an electrostatic generator to charge q 2. A is briefly touched to B. 3. Steps 1 and 2 are repeated until the charge on B reaches a maximum value. If the...

Let's say there is a conducting plane of conductivity \sigma. Boundary conditions for above and below such plane are: E_1^t = E_2^t (D_2 - D_1 ) \cdot n = \rho i.e. tangential components of E field are continuous and perpendicular components of D are discontinuous because of surface charge...

An infinitely long solid insulating cylinder of radius a = 5.3 cm is positioned with its symmetry axis along the z-axis as shown. The cylinder is uniformly charged with a charge density ρ = 45 μC/m3. Concentric with the cylinder is a cylindrical conducting shell of inner radius b = 14.2 cm, and...

Homework Statement A conducting spherical shell that has zero net charge has an inner radius R1 and an outer radius R2. A postive point charge q is placed at the center of the cell. The 1st part was to find the electric fields at the 3 diff places. The part I need help on is where we have to...

Question: Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of 0.141 N when their center-to-center separation is 67.0 cm. The spheres are then connected by a thin conducting wire. When the wire is removed, the spheres repel each other with an...

Homework Statement We have a metal conducting torus and a point charge that is located on the torus' axis (location on the axis is arbitrary). Calculate the (influenced) charge distribution on the torus and the electrostatic force on the point charge. Homework Equations Equation for...

Homework Statement At time t = 0 a charge distribution \rho(r) exists within an idealized homogeneous conductor whose permitivity \epsilon and conductivity \sigma are constant. Obtain \rho(r,t) for subsequent times. Homework Equations Maxwell's equations = Gauss' Equation + Ohm's...

Assume a infinite depth good conductor block with width in y and length in x direction. Boundary is at z=0 and air is at z=-ve and conductor at z=+ve. Let a voltage apply across the length of the block in x direction so a current density established in +ve x direction. We want to look at the EM...

what is the difference between the electric field intensity of 1)infinite plane charged sheet whose formula is E=\sigma/2\epsilono and 2)infinite conducting charged sheet whose formula is E = \sigma/\epsilono

Homework Statement Inside a metal conducting shell of radius R there is a negative charge q at a distance a from the center M. The shell is brought up to a potential V. What is the surface charge on the inside and outside of the conductor? The Attempt at a Solution I'm not sure if this...

Homework Statement Ok I'm going through last year's practice exam for electrodynamics and I'm stuck on a particular problem. For problem statement see attachment. q5a part i is fine but I'm confused with the other parts. Homework Equations...

In Griffiths Electrodynamics (page 397) electromagnetic wave reflection at a conducting surface is introduced. He says "for ohmic conductors, Jfree = sigma * E, there can be no free surface current since this would require an infinite electric field at the boundary." I don't understand why...

Homework Statement We have an infinitely-long perfect electrical conductor (PEC) cylindrical core (Region 3) of radius a surrounded by a dielectric layer (Region 2) of permittivity ε2 and radius b. The combined conductor/dielectric cylinder is embedded in an infinite space (Region 1) of...

Homework Statement A 5.5 cm radius conducting sphere is charged until the electric field just outside its surface is 1667 V/m. What is the electric potential of this sphere, relative to infinity? Homework Equations V = - integral ( E (dot) dl ) The Attempt at a Solution They only...

Homework Statement Two very long, straight, parallel wires carry currents that are directed perpendicular to the page as shown in Figure P30.9. Wire 1 carries a current I1 into the page (in the -z direction) and passes through the x-axis at x = +a. Wire 2 passes through the x-axis at x = -2a...

If you place a charge +q at the exact center of a conducting sphere, will it stay there or move to the surface?

Homework Statement A rod rotates clockwise about a point as pivot with the constant frequency 5 rev/s. Find the potential difference between its two ends, which are 80 cm apart, due to the magnetic field B = 0.3T directed into the page. Homework Equations There are two methods to find...

Hello fellow physics-people, I was just thinking about the following setup: We have a conducting surface (with smoothly varying resistivity) hooked up to some battery with the wires contacting the surface at two arbitrary points, A and B. How would we go about figuring out the current...

Hey, Completing AP Problems, I ran into a puzzling answer. Basically, there was a conducting sphere with charge Q on it and radius R1, and then around it two hollow hemispheres were placed (forming a spherical capacitor) which had no charge, with Radius R2 at the inner edge and R3 at the...

In a recent homework problem for my physics class, there was a question regarding a non conducting disk with a charge, and this rotating disk (axis or rotation perpendicular to the surface, through the center) will produce a B field because of the movement of charges. Now suppose I have a...