Charged Definition and 1000 Threads

Homework Statement A charge of 4.1 nC is placed uniformly on a square sheet of nonconducting material, with side 19.0 cm, that lies in a horizontal plane. 1. What is the magnitude of the electric field just above the center of the sheet? The same charge is placed on a horizontal square...

Homework Statement A disk of radius 10 [cm] is charged with 5E-9 [Coulon]. where on it's axis is the greatest electric field. Homework Equations The field on the axis of a charged disk: ##E=\frac{1}{4\pi\varepsilon_0}\frac{q\cdot \cos\alpha}{s^2}## The Attempt at a Solution I express...

Homework Statement Show that the Lagrangian $$ L = \frac{m}{2}(\dot{r}^2 + r^2\dot{\theta}^2 + r^2\dot{\phi}^2sin^2\theta) - qg\dot{\phi}cos\theta $$ describes the motion of a charged particle (mass ##m## charge ##q##) in the magnetic field ## \vec{B} = g\vec{r}/r^3## (##g## is a constant)...

Hello. I was taught that a charge which changes its velocity must radiate (at least, in classical electrodynamics). Let's consider a charged particle which decays into another charged particle (and, maybe, others neutral particles; but not photons). In this case, can we find electromagnetic...

Homework Statement A conductive ball of diameter 0.4 [m] is charged equally with a concentration of \sigma=8 [micro-coulon/m^2]. What's the total number of electric field power lines, N, that extrude from the ball Homework Equations The electric field near a conductor is like in a capacitor...

Dear all, I have inquiries about the Bohr's calculation for energy loss of charged particles. These inquires are from the "Techniques for Nuclear and Particle Physics Experiments" (W.Leo). On page 23 of this book, it is written that: the the interaction time is t = b/(γv), with b is the...

Hi all I gather a normal black hole has maximum angular velocity at the point that the event horizon is moving at The speed of light. However what would be the maximum rotational velocity for a maximally charged black hole- for example one made purely of electrons? Thanks

Homework Statement A velocity selector uses a 64mT magnetic field perpendicular to a 28kN/C electric field. At what speed will charged particles pass through the selector undeflected? Homework Equations v = E/B The Attempt at a Solution [/B] Using dimensional analysis, I converted units T...

Homework Statement Two small electrically charged objects are placed 6 centimeters (cm) apart, where they exert a force of 8 N on each other. How far apart must they be placed in order to exert a force of 1 N on each other? Assuming that the charges on the two objects are equal, what is the...

Homework Statement This is just a qualitative question that is along side my main lecture with Griffiths EM book. Basically we have a very long cylinder with charge density sigma and radius a along the z axis. This is mostly beside the point and is just to setup the question. The question...

I have two parallel conductive plates. The plates are charged to a high voltage by a HVDC power supply. When the plates are charged rf energy is present between them. What could be causing this? I am thinking field emission at the cathode is causing it ,but not really understanding physics is...

Dear all, I am reading the "Techniques for Nuclear and Particle Physics Experiments" of W.R.Leo. I am confused when reading the section 2.2. Energy Loss of Heavy Charged Particles in Atomic Collisions (page 21). At the beginning of the second paragraph (from the bottom up), it is written that...

Homework Statement Suppose the magnitude of the proton charge differs from the magnitude of the electron charge by a mere 1 part in 109.What would be the force between two 1.7-mm-diameter copper spheres 1.7cm apart? Assume that each copper atom has an equal number of electrons and protons...

Homework Statement Capacitors of 7.6 µF and 2.1 µF are charged as a parallel combination across a 333V battery. The capacitors are disconnected from the battery and each other. They are then connected positive plate to negative plate and negative plate to positive plate. Find the resulting...

Homework Statement Consider the spherical shell of radius R shown in the figure characterized by a hemisphere of surface charge density \sigma and total charge q in the upper half plane and a hemisphere of surface charge density -\sigma and total charge -q in the lower half plane. Find the...

Homework Statement Infinitely long cylinder of radius R with uniform charge ρ. Calculate the electric potential at all points in space. Homework Equations V(a)-V(b)=-∫ba\vec{E}(\vec{r}')°dr'\hat{r} The Attempt at a Solution Generally potential is calculated with a reference...

Case 1. You have a sphere with Radius R and middle point X with the charge Q. The charge is equally distributed over the sphere. for E(X,r) = 0 for r_1 < R, E inside the sphere is 0. If r_2 > R then E ≠ 0 ; but let's say E(X,r_2) := w If you put all the charge of the sphere into X then...

Hi everyone, I am struggling with gauss law. I understand the basic concept , but I can not relate it to other physics problems. I have this physics problem. I want to really understand physics, but I can't. I have watched a lo of videos but I still don't understand. I am going to give my...

Charged Particle thread with linear charge force Homework Statement A uniformly charged thread with linear charge density 5 C/m lies along the curve y = (3/m) x^2 for 0≤x7m. The y component of the electric force it exerts on a 6 C point charge located at (3m, 0m, 2m) is given by...

Homework Statement I recently encountered a problem wherein I was asked to calculate the potential difference between two non conducting concentric spherical shells of radii R1 and R2. Homework Equations ΔV=-∫E.dr The Attempt at a Solution While I was able to calculate the potentials of...

It is intriguing (to me) that while fractionally charged particles exist in the standard model, they are always bound into composite particles of integer charge. The standard model explains this by QCD: fractionally charged particles all have nonzero color charge, and so can't be free. But I'm...

1. Problem Statement A uniformly charged rod of length L and total charge Q lies along the x-axis as shown in in the figure below. (Use the following as necessary: Q, L, d, and ke.) (a) Find the components of the electric field at the point P on the y-axis a distance d from the origin...

Homework Statement Charge is uniformly distributed with charge density ρ inside a very long cylinder of radius R. Find the potential difference between the surface and the axis of the cylinder. Express your answer in terms of the variables ρ, R, and appropriate constants. Homework Equations...

Can someone please tell me the name of the theory describing the interaction of photons with charged particles eg electrons, protons? Can you also suggest a good introductory web page describing that theory at First Year University level for self study? Better still, a good VIDEO lecture on...

Homework Statement Find the potential on the rim of a uniformly charged disk (radius ##R##, charge density ##\sigma##). [Hint: First show that ##V=k(\sigma R/\pi\epsilon_0)##, for some dimensionless number ##k##, which you can express as an integral. Then evaluate ##k## analytically, if you...

Hello, I am trying to design an experiment where I can calculate the distance at which polarization will not have a measurable effect on a neutral object, from a sphere charged by a Van Der Graaf generator. I am measuring the weight change caused by the polarization of the neutral object with...

[b]1. Homework Statement [] Two spheres each of 5g, tied to 1.0m strings, repel each other after being charged to +91nC of the two spheres . What is the angle θ they form with the vertical after repulsion Homework Equations (1) F = mg...m=5.0g, g= 9.8m/s^2 (2) F = Kq1q2/r^2...

Homework Statement A metal sphere, of radius R and cut in two along a plane whose minimum distance from sphere's centre is h, is uniformly charged by a total electric charge Q. What force is necessary to hold the two parts of the sphere together? Homework Equations Elestrostatic equations...

I've found the equations of motion for a charged test particle in the Kerr-Newman geometry from a number of sources. However, they aren't very reliable and disagree on small details, so I'm trying to derive it myself. I'm completely stuck at the last step though, where you "use" the...

Hi I'm trying determine the electric charge configuration of my saran wrap. When it's wrapped up like this, I feel no electric field around it. But when I pull it I feel an E-field around the sheet i just pulled. At first I thought that the sheet was just polarized with net 0...

Please note that I neither hypothesize the existence of such particle, nor know any evidence of it. This is purely a what-if scenario. So, my questions are: 1)Is there any law or whatsoever that forbid the existence of a massless particle that possesses charge? 2)If such particle exist, how...

If i have a parallel plates capacitor , where the plates have different charges , eg, one plate has 1 C of charge and the other is neutral , what's the potential difference? what if i grounded the neutral plate , will it gain 1 C of charge?

I just wanted something to play with so I thought of this problem and solved it but now I have questions about it. Consider a charged particle with charge q and mass \mu which is constrained to move on the surface of a sphere of radius R. There is a magnetic dipole with moment \vec m=m \hat z...

Homework Statement Two point charges q1=1\muC and q2=-1\muC with mass 1g each are at distance 1m from each other. The charges are released from rest at . Find the time t in seconds at which they collide. Homework Equations F=kQ1*Q2/r^2.The Attempt at a Solution Let the dist. of separation...

If a charged particle is at rest, external magnetic field cannot move it. If an external electric field is applied, the particle will get accelerated. Now the external magnetic field will exert a force on the particle perpendicular to its motion. This will change the direction of motion of the...

Hi I am trying to find the equations of a charged particle inside a dipole & quadripole. Practically, I need to write a simulation program for it which assumes a beam passing through a dipole-quadripole-dipole which are setting around an arc. Is there some recommended literature ? Of course...

Homework Statement Find the electric field a distance z from the center of a spherical surface of radius R which carries a uniform density σ. Treat the case z<R (inside) as well as z>R (outside). Express the answers in terms of the total charge q on the sphere. Homework Equations E = \int...

Homework Statement Three charged particles are placed at the corners of an equilateral triangle of side 1.20 m (see figure). The charges are Q1 = +3.5 µC, Q2 = -7.2 µC, and Q3 = -5.1 µC. Calculate the magnitude and direction of the net force on each due to the other two. (Assume the +x axis...

Homework Statement On a long dielectric line a charge with density ##10^{-3}## is applied one half with positive charge and the other half with negative charge. Perpendicular to the first line and 5 cm away from it we have another line with the same charge density and also half of it is...

Two small particles have electric charges of equal magnitude and opposite signs. The masses of the particles are m and 2m. Initially, the distance between the particles is d, and the velocities of the particles have equal magnitude v. However, the velocity of particle 2m is directed away from...

Homework Statement Two objects carry initial charges that are q1 and q1 respectively, where |q2| > |q1|. they are located 0.200m apart and behave like point charges. they attract each other with a force that has a magnitude 1.2N. the objects are then brought into contact, so the net charge is...

Picture: - - - ---------------------------------- p -> ---------------------------------- + + + Positively charged particle "p" is initially moving to the right between two capacitor plates. Is the...

1. Problem - Notes Jumbled, do not know if I am missing variables or not needed to answer the questions? Disclaimer: I am good at maths, fine with algebra and derivations, I just forget the formulae and units, especially when I haven't practiced things a lot, such as this topic (other subjects...

Hello. Can you please check out the attachment? Solving (a) is easy. The correct answer to (b) is "the period for the return trip is unchanged" (that is, T = 130 ns). Okay, fine: the attachment shows why T only depends on m, q, and B. How on Earth, though, do you reconcile this with the...

What's the difference between electric and magnetic fields, specifically I someone was to send a charged particle into them? Are there any similarities?

So the problem statement is: A conducting solid sphere (R = 0.167 m, q = 6.63·10–6 C) is shown in the figure. Using Gauss’s Law and two different Gaussian surfaces, determine the electric field (magnitude and direction) at point A, which is 0.00000100 m outside the conducting sphere. (Hint: One...

I was wondering how could I hold a lot of charge inside, for example, a ball. I thought by wrapping it in an isolant and using a hole with a semiconductor to charge it without letting anything out. But them it also could blow apart by the repulsive force of itself. Therefore, I got curious of...

Hello, I recently received a USB power pack but I can't seem to charge the dumb / feature phones that I have. When I use this adapter to connect the phones they say that they are charging but even after 5 hours they seem like they didn't get a charge t all. Is the voltage difference the...

Homework Statement see attachment 2 Homework Equations a. The Attempt at a Solution see atachment 1 i am stuck at problem a. the question is to write down the boundary conditions for that the E field has to satisfy infinetly far away from the wire and at the boundary of...

Can we calculate the electric field at any given point in space even if there are no charged particles there? The equation for electric field given in a standard EM course is kqq0/q0r^2 where q0 is a test charged impacted by the electric field. How about just any point in space?