Charged Definition and 1000 Threads

http://imageshack.us/photo/my-images/543/unledyel.png/ This is a chamber, immersed in a magnetic field, containing circulating electrons shot into a gas. My question is: why is the direction of rotation for the electrons (as shown on the picture) clockwise and not counterclockwise? I am...

Not much more to add to the title. I was just wondering, under what conditions can a charged sphere be treated as a point charge?

If a conducting sphere has a negative net charge and there is a positive point charge at the center of the sphere, what charge would you use to find the Electric Field at a point outside the sphere? The equation is E=kq/r^2. Would I use the net charge of the sphere, or do I need to...

Homework Statement A capacitor is charged with some potential difference. A charge will developed on both of it's plates. Now remove this capacitor from battery and ground/earth one of the plate through a wire. What will happen?? Homework Equations gauss law The Attempt at a Solution...

Greetings- I'm playing with the differential equations to get the standard or classical solution for the circular motion of a charged particle in a magnetic field. I have some question on my math. I'm doing this for fun - (just because) Should I post this in the homework section. Does...

Problem is: You have a non-uniformly charged solid cylinder along x-axis who's volume charge density (ρ=ρ°+vx), v is constant, changes according to where you are in reference to center of cylinder (origin). At center there is a charge q. Find force felt by the charge due to the cylinder. I know...

Hi everyone, Homework Statement Let a charge Q be uniformly distributed on a circular ring defined by a < \rho < b. Find D at (0,0,h). Homework Equations E = kQ/r2 ar D = \epsilono E The Attempt at a Solution Well I thought I had this figured out, but I was wrong and I still...

Electric Force problem --> Infinite charged plane with hole The plane is infinite charged. It has a charge density (σ) of 10nC/m^{2}. If R=5cm, determine the electric force of a proton in the point P=(0,0,10cm). =====================================================================...

The Image has all the details: http://img38.imageshack.us/img38/3448/question3p.jpg Uploaded with ImageShack.us I honestly I have no Idea as to where I should begin. Any hints on how to get started?

Homework Statement Consider a uniformly charged solid cylinder of radius R, length L and charge density ρ. Find the potential at a distance d (> L/2) from the centre of the object, along the axis of the cylinder. Homework Equations V=∫kdq/r The Attempt at a Solution For me, it...

Homework Statement There is a non-conducting charged rod with length L=.0815(m) and linear charge density λ=-5.9x10-14(C/m). The rod is placed parallel to and on the x-axis, and at a distance a=.12(m) from the right-most end of the rod is point P. Calculate the magnitude and direction of E...

Homework Statement A cylindrical shell of radius 7.00 cm and length 240 cm has its charge uniformly distributed on its curved surface. The magnitude of the electric field at a point 19.0 cm ra- dially outward from its axis (measured from the midpoint of the shell) is 36.0 kN/C. Use approximate...

An initially neutral conductor contains a hollow cavity in which there is a + 65.0 nC point charge. A charged rod transfers - 75.0 nC to the conductor. Afterwards, what are the charges along the inner surface and the exterior surface? I understand that the charges from the rod are equally...

There is a parallel plate capacitor having capacity C. It initially has got no charge on it. Now we insert a dielectric material of dielectric constant K between its plates (it still has no charge). Now we connect this capacitor (with dielectric) to a d.c source of potential difference V. Now...

[SOLVED] Charged particles deflecting in a statics question. Homework Statement A particle mass 2g and carrying a charge of q is suspended from a light, insulating thread. A second particle carrying an equal and opposite charge is held near to the first particle in the same horizontal plane...

Suppose there exists a black hole with a large + electrical charge. The escape velocity for any given particle will depend on the net force on it, gravitational + electrical. It seems logical that the more positive a particles charge the lower its escape velocity will be from any given point. If...

A conductor carries a net charge +Q. There is a hollow cavity inside the conductor that contains a point charge -Q. In electrostatic equilibrium,what is the charge on the outer surface of the conductor? A. -2Q B. -Q C. 0 D. Q E. 2Q I know that the answer is 0, however, I cannot...

Homework Statement A charged cork ball of mass m is suspended on a light string in the presence of a uniform electric field, as shown in the figure below. When E = (Ai + Bj) N/C, where A and B are positive numbers, the ball is in equilibrium at the angle ?. b) Find the tension in the...

I need to find the electric field at all values of radius for an infinitely long cylinder of charge. It's in insulator of radius R, and has a volume charge density \rho = \rho_{0}(\frac{r}{R}) while r<R. I need to find the electric field at all points first off. I'm not entirely sure how to go...

Homework Statement There is a charged dielectric sphere of radius R. I center it at the origin of an x,y,z cartesian system. It has a charge density rho=3Qcos(theta)/4*Pi*R^3. Q and R are given. I need to find the Electric field at a point that is outside the sphere. Homework...

I can't figure out what is the motion of a charged particle at rest at origin in a constant uniform magnetic field when it is subjected to an oscillating electric field starting t = 0. I need to find the equations representing its motion.

Homework Statement Solve for the Electric force exerted on a Particle a distance z above a uniform ring of charge Q. Determine the potential energy of the charge where the charge lies directly in the center. Homework Equations F=kq1q1/r^2 The Attempt at a Solution Knowing E=F/q I...

Homework Statement This is primarily a question that I'm trying to program into python. I want to know the potential at some distance (x,y) from the center of a square plane. Homework Equations V = integral (k/r) dq The Attempt at a Solution The way I see this mathematically is a...

Homework Statement Determine the electric force exerted on a negative point charge –Q located a distance d away from a line segment of charge, extending from –L/2 to +L/2 along the x-axis. The line segment has a non-uniform charge distribution, lambda(x)=lambda_0*x . Homework Equations...

The Problem is as follows: A ring of diameter 7.50 is fixed in place and carries a charge of 5.50 uniformly spread over its circumference. A) How much work does it take to move a tiny 3.80 micro-columb charged ball of mass 2.00g from very far away to the center of the ring? B) What...

They say accelerating charged particles emit electromagnetic radiation(emr). Ok. Take a mass m, apply a force F on it and it will cause acceleration. All the energy i apply on m will go to its kinetic energy, so conservation of energy is obtained. Now take a charged particle p, apply force f and...

Homework Statement A sphere of radius a carries a uniform charge density \rho_0 in one hemisphere and the opposite charge density -\rho_0 in the other hemisphere. The charged sphere produces an electric potential \Phi (r,\theta,\phi). For r>>a, the potential to leading order is of the...

Homework Statement A dipole consisting of charges +/- e 220 nm apart is placed between two very large (essentially infinite) sheets carrying equal but opposite charge densities of 125 uC/m^2. a) What is the maximum potential energy this dipole can have due to the sheets, and how should it...

Imagine I am sitting on a lead ion and fly happily through the LHC tube :approve:. Suddenly I feel an strong force pushing me sideways to the left. A physicist sitting in the lab frame tells me later, that I have been going through a dipole magnet yoke with field lines from top to bottom...

Homework Statement Two parallel, very long strips are uniformly charged with charge densities \rho_{s} and - \rho_{s}, respectively (\rho_{s} > 0). The cross section of the structure is shown in the figure attached. The width of the strips is the same as the distance between them (i.e. a)...

Homework Statement A line charge of uniform charge density Q' is distributed along a square contour a on a side. The medium is aie. Find the electric field intensity vector at a point that is at a distance a from each of the square vertices. Homework Equations The Attempt at a...

Homework Statement A uniformly charged insulating rod of length 14.0 cm is bent into the shape of a semicircle. The rod has a total charge of -7.50\muC. Find (a) the magnitude and (b) the direction of the electric field at O, the center of the semicircle. Homework Equations...

Hi. I want to know if I did this on the right way. The exercise says: An infinite hollowed cylinder, with the cavity being another concentric cylinder has a uniform charge density. Find the electric field and the potential over all space. And this is how I proceeded. I've called the inner...

Hello all, I got this question off mastering physics and was unable to understand it. I eventually gave up to concentrate on other assignments and asked for the answer. I was unable to come up with more than one answer I thought possible without resorting to trial and error. Answer: Vx,Vy,Vz =...

Homework Statement Identical isolated conducting spheres 1 and 2 have equal charges q and are separated by a distance r large compared to the diameters of the spheres. The electrostatic force acting on sphere 2 due to sphere 1 is 3.10-6N. Suppose now, that the third identical sphere 3, having...

Greetings all! I'm completely new to Quantum Mechanics (my PhD research is in Computer Vision) and I am planning to apply some concepts to my research. I would like to know whether it's possible to get the Wave Equation over the components of a \mathbf{B}=(B_\phi,B_r,B_z) field induced by...

Homework Statement Show for a solid spherical ball of mass m rotating about an axis through its center with a charge q uniformly distributed on the surface of the ball that the magnetic moment \mu is related to the angular momentum \vec{\mu}={\frac{5q}{6mc}}\vec{L} Homework...

Homework Statement A charged particle with mass m = 200g and charge q = 25 µC is suspended from an elastic cord with force constant K = 5 N/m in a vertically upward electric field E of magnitude 3.7 x 10^5 N/C. What is extension of the cord when the particle is in equilibrium? Homework...

Homework Statement A point charge q1 = -7 μC is located at the center of a thick conducting shell of inner radius a = 2.6 cm and outer radius b = 4.9 cm, The conducting shell has a net charge of q2 = 1.1 μC. What is Ex(P), the value of the x-component of the electric field at point P...

"Diameter of a soap bubble increases when it is charged." why?

A charged hollow sphere with surface charge density \sigma & radius R is cut into two hemispheres...certainly the hemispheres with equal charges on them would repel each other...Now a force is applied on both the hemispheres to align them again as the original sphere..i shall be highly thankful...

Homework Statement the e field is given by (2*pi*k*omega)[1-(1+(R^2)/(z^2))^-.5] I was wondering if the capital R in that equation is the radius of the charged disk? And if so, why is it capitalized?

In a very good book, Chabay and Sherwood explain that when an initially uncharged person touches a negatively charged metal object, free electrons from the metal neutralize some Na+ ions in the salty layer on the person's skin. The person then becomes negatively charged and the neutral Na atoms...

An accelerating charged particle produces EM radiation. Does gravity cause this effect as well? Does the particle actually accelerate due to it or would it not since it would be following a straight path through curved spacetime? I'm guessing the particle would not create EM radiation, but I'm...

Hi I'm sorry if this is posted in the wrong section or it's laid out wrong but I have a question that I need a bit of help with. Homework Statement I'm given: A spherically symmetrical charge distribution is contained within a sphere of radius a with no charge outside. At a distance r (r...

Homework Statement A particle of mass m and charge q is attached to a spring with force constant k, hanging from the ceiling. Its equilibrium position is a distance h above the floor. It is pulled down a distance d below equilibrium and released, at time t = 0; Under the usual assumptions...

Homework Statement Two hard rubber spheres, each of mass m = 15.1 g, are rubbed with fur on a dry day and are then suspended with two insulating strings of length L = 4.90 cm whose support points are a distance d = 2.97 cm from each other as shown in the figure below. During the rubbing...

Anders (not the monster) became only 18. As he and two friends tried two hide from the shooter they heard, they tried to secure a place on a mountain ledge, but Anders slipped and fell 10 meters onto the stony shore. He was killed by that accident. Håkon became only 17. Håkon was not a...

I am considering a positive charged particle moving with the velocity v into the magnetic field field B making an angle theta with the magnetic field, so the magnetic force exerted on the charged particle is perpendicular to the plane of B and v. My question is-Why the speed of the charged...