Charged Definition and 1000 Threads

Homework Statement Two charged metallic spheres of same size repel each other by a force F. They are now touched with each other and are then separated to same initial distance. Now the force of repulsion is F'.Homework Equations On touching the spheres will reduce their charges... So the new...

How can I find the electrostatic potential of any point on a charged disk with radius R and surface charge density σ

Homework Statement You wish to determine the electric field magnitude along the perpendicular bisector of a 230-mm line along which35 nC of charge is distributed uniformly. You want to get by with a minimal amount of work, so you need to know when it is sufficient to approximate the line of...

Homework Statement In the "Before" scenario, there is conductive plate in electrostatic equilibrium with uniform surface charge density +η (the plate has some thickness but the width and length are significantly larger). In the "After" scenario, an infinite plane of negative charge with fixed...

Homework Statement A collection of charged particles move through a magnetic field at an angle to the field lines. Calculate the velocity of the particle if it is an electron moving at 30 degrees to the magnetic field of strength 3.4mT, causing it to experience a force of 4.7x106-18N Homework...

I understand the basic forces moving charges experience in magnetic fields. I dont; however, understand how these these charges would interact with particles uninfluenced by the magnetic field. 1. If a charged particle is moving perpendicular to a uniform magnetic field, it will follow a...

Homework Statement An uncharged capacitor is connected to a charged capacitor as shown: The ends are left as it is. Will the charges redistibute? Homework Equations None The Attempt at a Solution I think it won't. Let the first capacitor be charged with charge Q. Before closing the switch...

Homework Statement [/B] I have two spherical metallic shells with radius ##3a## and ##a##, the little one is placed inside the larger so that the center of the little one is at a distance of ##a## from the center of the larger. The outer one has a charge ##3Q## and the one inside has a charge...

Homework Statement An uncharged metal sphere hangs from a nylon thread. When a positively charged, nonconducting glass rod is brought close to the metal sphere, the sphere is drawn toward the rod. But if the sphere touches the rod, the sphere suddenly flies away from the rod. Explain why the...

As the name of the thread says, I am wondering what would the amount and the direction of the electric field at some point in the uniformly charged ball of radius R(it has a constant charge volume density) be at the distance r from the centre of the ball. Does anyone know what would they be? I...

Homework Statement I want to find the force on a positive charge placed at a distance ##d## from a positively charged infinite plate. Of course, it can be simply done by finding the electric field due to the plate using Gauss's Law. But my teacher suggested a different method and I am unable...

Homework Statement So, I got the problem from a friend who told me he copied it down in haste, so it's possible that my confusion stems from a missing variable, but I just want to be certain as my exam is in a few days. So the problem states that there's a +2 helium atom that was accelerated by...

Does the cycloid motion of the picture only apply to a particle at rest in the x y and z axis? What if it is moving with a velocity parallel to the magnetic field before the electric field accelerates it? I think it will then move in a spiral; although, I am not sure.

Homework Statement My teacher came yesterday, and put in the board one exercise, just the scheme, not aditional data, i have one picture of the scheme Homework Equations The given E its mean to electric field The Attempt at a Solution I need some help, go get the right way into problem [/B]

Homework Statement [/B] A) Calculate the electric potential at point A. B) If a small charged particle with a mass m=5.0 mg and charge q=7.0 nC is released from rest at point A, what will be its final speed vf Homework Equations V=Kq/r Uelec=qV Uelec=1/2mv2 The Attempt at a Solution A) I...

Homework Statement 2. Equations v=q/4πrε 3. Attempt at solution Can I find the total charge by integrating the charge density equation from 0 to 2π and then plug that into the above equation?

Homework Statement Find the initial velocity of an alpha particle with a mass of ##6.64 \times 10^{-27} kg## and a charge of ##+3.2 \times 10^{-19} C##, if it undergoes a head on "collision" with a gold nucleus. You may assume the gold nucleus does not move at all during the interaction. The...

I have read that electric field at any point( not only at center) inside a uniformly charged spherical shell is zero(by symmetry). But if we take a uniformly charged cubical box, will electric field be zero at every point inside the box? I am confused please help ( I think it should not be zero...

Homework Statement Given a charged ring in 2-d, what is the e-field inside the ring? Homework Equations Epoint = kq/r^2 The Attempt at a Solution This isn't a homework question, but more of a problem I keep running into whenever I think about it. I assumed it was 0. I came to this conclusion...

What happens when negative plate of a charged capacitor is connected to positive plate of another charged capacitor and vice versa. ?

Why he did not consider parallel force?Will parallel component of electric field not produce electric pressure on the surface?

Homework Statement Calculate the magnitude and direction of the electric field due to the ring in the point P on the z-axis. Homework Equations Charge distribution on the ring is given by λ(φ)=λ_0\cdot sin(φ). This should result in the total charge on the ring being zero. Electric field is...

Homework Statement A thin rod carries a charge Q distributed uniformly over its length L , and is situated on the x-axis between x=±L/2. Find the electric field at an arbitrary point (x, y). (You will have to do separate integrals for the x and y components.) Homework Equations ∫dE=∫kdq/r2...

Hydrogen fusion as described by proton-proton chain reaction that dominates in the sun produces two positrons for each helium nucleus produced. These annihilate with free electrons while the number of protons remain the same. Over time the sun is supposed to become positively charged, yet the...

I'm totally confused what the question is asking. I do not know how to start... please help A charged sphere with 1×108 units of negative charge is brought near a neutral metal rod. The half of the rod closer to the sphere has a surplus charge of 2×10^4 units. What is the magnitude of the...

Inside a charged sphere, the electric field strength is zero because there are electrostatic forces from all directions. I can't understand why electric potential inside the charged sphere is maximum ?

Does anybody know what happens when say a laser accelerates charged particles? Do photons get absorbed and the intensity of the laser drops, or do they get absorbed and scattered and there's a redshift of the photon etc

Coulombs law states 2 point charges of opposite sign will attract where acting simultaneously on two point charges and as follows: The formula calculates the force that will act and implies the force be equally experienced by both points of charge even if one charge is much greater than...

Homework Statement Two large, parallel, conducting plates are 7.5 cm apart and have charges of equal magnitude and opposite sign on their facing surfaces. An electrostatic force of 1.3 × 10-15 N acts on an electron placed anywhere between the two plates. (Neglect fringing.) Find the magnitude...

Hello , I post a message because I will need help with this exercise I would like to knowif my answer are good, I'm french : An infinite hollow cylinder charge is constituted of a sheath whose outer limits are R2 and R3. Wearing a uniform charge density ρ Question 2)calculate the total...

If I have an electric field between a cathode and an anode, are there electric field lines between the plates? If yes, what happens if a charged particle enters the field at an angle? Is the force acting on the particle reduced?

Let's see delocalized electron cloud on a surface of a metal (a piece of iron for example): When a strong Nd magnet get close the spin of these electrons allign to the magnetic field but the electrons don't move. Why? The force is not canceled out. Electrons should move and compressed in one...

Homework Statement A cone of height H and base radius A is charged with charge Q uniformly distributed in all its volume. Find electrostatic field intensity at the top of the cone. DATA: H, A, Q Homework Equations E=ρ/(4πε0) ∫Ω dΩ/R2) and R is a vector (rr^+zz^) r^ and z^ are versors The...

I understand earthing as - if we Earth a charged body, its charge distribution changes such that, its potential becomes zero. So now I have a doubt that if we have 2 charged spheres(Q1 , Q2) ,separated by some distance and then if we Earth one of them , then how will the charge distribution...

If two simple pendulum with charged bobs hanging from the same point are taken in a satellite ,then their strings will become perfectly horizontal. I think that should be the case when these bobs are charged with similar charges and hence repulsion occurs but what if the bobs are oppositely...

Homework Statement I'm having a bit of trouble evaluating the following commutator $$ \left[T^{+},T^{-}\right] $$ where T^{+}=\int_{M}d^{3}x\:\bar{\nu}_{L}\gamma^{0}e_{L}=\int_{M}d^{3}x\:\nu_{L}^{\dagger}e_{L} and...

Is it possible for skin to hold a negative or positive charge on one part of the body, such as the back of a hand? How does this occur? Thank you

What is the direction of field inside a charged non-conducting sphere? Using gauss law, I can find the magnitude of electric field inside the shell by assuming a spherical Gaussian surface. But how can I find its direction? Also, if electric field exists inside a charged sphere, wouldn't the...

Homework Statement A charged body, moving with a velocity of 8.0 * 104m/s at an angle of 30.0° with respect to a magnetic field of strength 5.6 * 10-5 T, experiences a force of 2.0 * 10-4N. What is the magnitude of the charge? Homework EquationsThe Attempt at a Solution I have no idea where to...

Hi, I'm having an issue with finding a starting point for the following problem. I've looked through my magnetism and electrodynamic notes but was unable to find a starting point. Could someone please help direct me on the correct path? Thank you. Homework Statement A thin circular disc of...

Homework Statement Consider two solid dielectric spheres of radius ##a## separated by a dis- tance ##R## (##R\gg a##). One of the spheres has a charge ##q## and the other is neutral. We scale up the linear dimensions of the system by a factor of two. How much charge should reside on the first...

...perpendicular to its path? OK; let's say you have any charged particle moving perpendicular to a magnetic field; does it describe a gigantic polygon or a perfect circle? I think it's a polygon; the particle absorbs a "quantum of force" from the magnetic field, so to speak, and changes...

I'm reading how a charged particle moving through a magnetic field experiences a force (called magnetic force). I understand that it moves the particle in a certain direction and because the greatest force is experienced when the magnetic field is perpendicular to the particle's velocity vector...

I would like to ask your opinions on what would happen if you had a liquid containing charged particles and then applied a sinusoidal magnetic field? 1. would the particles move in one direction and when the current changes direction then move in the other direction? 2. would there be a...

Hello, My question is about accelerating charges generating electromagnetic radiation, and is more of a theoretical one, or a thought-experiment in my head...probably because I'm not totally understanding something. I was playing with this applet which simulates the electric field lines of a...

http://www.phys.uri.edu/gerhard/PHY204/tsl93.pdf To find electrical potential at r<R I want to know why should we subtract ##V##=-##\int_∞^R\frac{kQ}{r^2}\,dr##-##\int_R^r(0)\,dr##=##\frac{kQ}{R}## I don't know why are we subtracting these two?

1. Question: There is a wire with charge, surrounded by a metal cylinder with opposite charge. There is a dielectric surrounding the wire, going out half way to the outer cylinder. Calculate the D field in the region between the cylinder and wire.Homework Equations : [/B] Gauss's law for...

Homework Statement Find Electric field at center of charged hemispherical shell Homework Equations In spherical coordinates, $$dA=R^2\sin\phi d\phi d\theta$$ The Attempt at a Solution From the image, Enet=2dEy=2dEcosφ $$dE=\frac{kdq}{R^2}E$$ $$dE=\frac{k\sigma dA}{R^2}$$ $$dE=\frac{k\sigma...

Homework Statement Diagrams (a) to (c) show a magnetic field of flux density 0.2 T directed perpendicularly into the paper. In each of (a) and (b) a conductor of length 0.3 m is entirely within the field and is carrying a current of 4 A in the plane of the paper. In (c) an electron is moving in...

Homework Statement Two particles are separated by a distance d, Particle A has charge +Q and Particle B has charge +3Q. At what distance from particle A along the line connecting particles A and B would you place a third charged particle such that no net electrostatic force acts on it ...