Electrostatic Definition and 884 Threads

There is an arbitrary vector A=A[R](R,θ,∅)R(phasor) + A[θ](R,θ,∅)θ(phasor) + A[∅](R,θ,∅)∅(phasor). What relationship exists between the three functions A[R], A[θ], and A[∅] if this vector is either: A: Electrostatic Field B: Magnetic field I really have no...

What are the criteria for choosing an elctrostatic filter?

Homework Statement 4 identical charges each equal to Q are placed at the 4 vertices of a regular triangular pyramid of each side equal to 'a'. Find the net electrostatic force on anyone charge. Homework Equations F = kQ^2/a^2 The Attempt at a Solution find the force due to each...

Hi all, I am considering the situation illustrated in the schematic below. A surface density of permanent charges σ is embedded into a dielectric (with relative permittivity εr) itself sandwiched between two electrically floating metallic plate. We have also L>>t1 and L>>t2. My first goal is...

Is the repulsive force between 2 electrons---(as in an electrostatic situation)---mediated by a photon----?------R Rosenthal

I know this is a general Mechanical Engineering forum, but there is no Hydraulic forum and this is the nearest trade. https://www.youtube.com/watch?v=47Dx6TvuJTc I've been doing a project on electrostatic discharge, and the company I work for (I won't mention the name as I'm not here...

Homework Statement In a precipitator, at the bottom is a negatively charged wire mesh while at the top is a set of rods at the two sides that are either earthen or positively charged. The purpose of the negative wire mesh is to charge the flue ash negatively by conduction then it is...

Homework Statement Why must the object that is undergoing electrostatic spray painting be earthed/grounded? 2. The attempt at a solution I understand that during electrostatic spray painting, the paint droplets are positively charged and they are attracted to the negatively charged...

hello folks, Actually I'm not an engineer, but i have a couple of questions regarding electricity and i hope i am posting this in the right forum :) 1- when there's a charged object, that comes close to another object, a spark tends to happen between them, so that the charged body emptys...

A solid sphere carries a uniform, surface-charge density. The sphere is surrounded by a linear dielectric with electric susceptibility, κ. For which system is the electrostatic energy the largest. a) For the sphere alone. b) For the sphere and the dielectric. c) Both systems have same...

Hello everybody, I have a doubt about the section of the Wikipedia page on the polarization: https://en.wikipedia.org/wiki/Polarization_density especially the section in the end where the writer claims the polarization is ambiguous. In the example about Alice, the writer states that...

The most difficult aspect of hydrogen fusion is overcoming the electrostatic forces that cause the hydrogen nuclei to repel each other. Would it be possible to place one of the nuclei inside some conducting sphere like a Buckminsterfullerene so that the fullerene acts as a Faraday cage? The...

Homework Statement What is the angle θ between the electrostatic force on the charge at the origin and the positive x-axis? Answer in degrees as an angle between -180 degrees and 180 degrees measured from the positive x-axis, with counterclockwise positive. Coulomb constant is 8.98755e9...

I am working on the following. A point charge of √3Q is at point (3a, a, 2a) Find charge at (2a, 2a, 3a) I'm using Coulomb's Law E(r) = q / 4∏ε0 (r-r0)3 ([B]lr-r0l[B] & can get through most of it, but looking at my book I can't see why the last step occurs. See attachment. I can find r-ro &...

Homework Statement There is a uniform electric field with strength E_0 .Then we place a conducting spherical shell with a dipole at the center of it,inside the field,somehow that the dipole moment is prependicular to the initial field.Find the potential/electric field of the new...

Hi, I'm trying to build an electrostatic spray system. They are commonly used for spraying cars and pesticides onto fields of crop efficiently and easily. The spray is given a negative or positive charge that makes the spray attracted the opositely charged target (car or plant etc), ensuring...

Hello, I needed some help for my physics homework. The aim is to design an experiment that answers the question: Is the number of rubs of a piece of mica (that bag where you put documents to file them or to protect them, often made of plastic. Here is a Pic...

Is paint a conductor of electricity? Since we charge the paint and let it move to the metal body of a grounded car so an opposite charge on the car. So when the paint reaches the car will the paint get discharged or will the charges on the car remain the same? Like the paint and the car body...

Homework Statement 4He2 has size of ~ 2 x 10^-15 m and a mass of 4.0015u. Calculate the binding energy of this nucleus, and compare it to the electrostatic repulsion of its constituents. Homework Equations The Attempt at a Solution For the first part I have calculated...

Hello all, I just finished building an expansion cloud chamber this weekend and have started experimenting with it. Everything looks solid (vacuum, seal etc) but I'm curious about the role my electrostatic field, generated from a bug zapper and a circuit, plays in visualizing the ionizing...

I understand that there are many different kinds of electrostatic precipiators but I'm referring to the type where a negatively charged wires are placed in between two grounded plate. This essentially makes it a positive plate. So when the smoke rises up they are ionized and thus the ions are...

Homework Statement Three point charges are located at the corners of an equilateral triangle as in the figure below. calculate the net electric force on the 7-nc charge. Each sides are .5 m. (q1=7μc) (q2=2 μc) (q3= -4 μc) ___1 __/__\ 2/____\3 Homework...

Homework Statement 3 identical charges of 2.0 uC are placed on the x-axis. The first charge is at the origin, the second to the right at x = 50cm, and the third is at the 100 cm mark. What are the magnitude and direction of the electrostatic force which acts on the charge at the origin...

Homework Statement The transformation z=1/2(w + 1/w) maps the unit circle in the w-plane into the line −1≤x≤1 in the z-plane. (a) Construct a complex potential in the w-plane which corresponds to a charged metallic cylinder of unit radius having a potential Vo on its surface. (b) Use...

Homework Statement The transformation z=\frac{1}{2}(w + \frac{1}{w}) maps the unit circle in the w-plane into the line −1≤x≤1 in the z-plane. (a) Construct a complex potential in the w-plane which corresponds to a charged metallic cylinder of unit radius having a potential Vo on its surface...

Hi guys I came upon this problem while solving in a book, there is something I am confused about the way he solved it in the answers. (II)Three charged particles are placed at the corners of an equilateral triangle of side 1.2m. The charges are 4uC,-8uC,and -6uC. Calculate the magnitude...

Homework Statement The electrostatic potential at each point in the region 4x^2 + 9y^2 <= 36 is given by f(x,y) = 3x^2 + 2xy - y^2 + 5. Find the maximum potentials in the region. (Without using Lagrange Multipliers). The solution also said how to do it with Lagrange Multipliers but I...

Hi all , I need some help with this problem, Homework Statement A hydrogen atom, which is in its ground state |1 0 0 > , is put into a weak time-dependent external electric field, which points into the z direction: \boldsymbol{E}(t,\boldsymbol{r}) =...

Homework Statement A particle with charge −8 μC is located on the x-axis at the point 8 cm, and a second particle with charge −6 μC is placed on the x-axis at −6 cm. What is the magnitude of the total electrostatic force on a third particle with charge −4 μC placed on the x-axis at −2...

There is the problem which i haven't been able to understand: "Show that the tangential component of an electric field is continuous from one side of a conductor to the other" What exactly is asked and how to prove it? Thanks!

Homework Statement Homework Equations PE = -Fdcos(theta) PE = -(qE)dcos(theta) PE= -pdcos(theta) or PE = - pd since all the angles here are nice. where p is dipole The Attempt at a Solution :( beyond trying to find what looks like the answer, I'm not sure many thanks!

i am in total confusion to co-relate p.d of electrostatic and p.d of electricity. can somebody help me out?/

Homework Statement What does the slope represent for a graph of force of electrostatic (y-axis) as a function of product of charge (x-axis)? -charges are not given - the experiment was done by charging 1 sphere, touching it with sphere two so that each sphere is 1/2 q. By touching sphere 1...

Homework Statement 3 point charges L(-b, b) M(b, b) & N(0, 0) have charges Q, -3Q & Q. I need to find the force on the charge at the origin. Homework Equations Coulomb's Law important, here. F = 1/4∏0 q^2/r^2 r(hat) z-component no existent (from coordinates given) x- & y-components to...

Homework Statement Based on Volts and distance, calculate the max Electric Field between lines. Homework Equations The Attempt at a Solution We basically connected a 6Vdc battery to a plate containing two conductors and use a multimeter to plot the lines of flux of the field. To find...

Hi guys I have 3 question the first one I want to check if my answer is correct or not but the two other question I don't know how to approach them thanks. 1)The 500 gram mass carries a charge of –7 x 10-8 C. If the coefficient of friction between the mass and the surface is 0.20, and an...

I was wondering if induction can apply to different chemical solutions. Take HCl for example. If a negatively charged rod were placed against the beaker in which HCl was held, would the H+ ions be pulled towards the rod. Would the same outcome appear in a neutral solution of NaCl (drawing the...

There is given two neutral parallel plates, distance between them is d. Between them is putted insulating plate with a thikness of d. After that one of two plates was charged positively. How can I find electrostatic interaction force?

Homework Statement Two engineering students, John with a mass of 90 kg and Mary with a mass of 45 kg, are 30 m apart. Suppose each has a 0.01% imbalance in the amount of positive and negative charge, with one student being positive and the other negative. Find the order of magnitude of the...

Hi All I'm a professional Electronics Engineer and very much an amateur physicist. I'm trying to find the force exerted between 2 parallel plates for a given plate voltage, separation, and plate area. I've found plenty of wiki's, google pages etc etc of force between 2 point charges...

i can't grasp the idea that how is electrostatic induction possible in a conductor. for example, if a negatively charged strip is brought near a metal conductor, the electrons will be repelled to the further end of the conductor thus making the end near the charged rod positively charged...

Homework Statement Three identical small Styrofoam balls (m = 1.95 g) are suspended from a fixed point by three nonconducting threads, each with a length of 52.1 cm and with negligible mass. At equilibrium the three balls form an equilateral triangle with sides of 28.3 cm. What is the common...

Homework Statement How far apart must two electrons be placed on the Earth's surface for there to be an electrostatic force between them equal to the weight of one of the electrons? Homework Equations Fe = (1 / 4∏ε0) X (q1q2 / r^2) The Attempt at a Solution I set Fe = me-...

Homework Statement In the region x ≥ 0 there is an electrostatic potential V(x)=xexp(-λx) where λ>0 What is the electrostatic field at x→∞ Homework Equations The Attempt at a Solution My understanding is there is no fields at infinity because there is no electrostatic potential...

(please help-still not solved) electrostatic force lab debate For lab, we had to do the following experiment, and me and my friend are not agreeing as to whether we have correct data: We had to charge a ball, then while holding that ball, bring it to a similarly charged ball that was hanging...

Hi everyone, I don't know how I manage it but I've gone and confused myself about something which I was fairly confident about right before an exam... again! So here's the deal. Let's imagine two particles A and B which have charge Q and q respectively and are separated by a distance r (I...

Hello i have a problem that i need help with. Two fixed charges 'q' and '4q' are positioned along an axis with a separation d=5cm a) Calculate the forces acting on each charge Attempt - I understand that the the force eqn is F = qE - I also understand that i need to work out the...

Though EE was the best section but if not I'll repost or get a mod to move it. We were learning about Electrostatic precipitators that are used in power stations and the like to remove dust particles from the smoke they release. However in the diagram that our teacher had it just showed...

Hello, i have to solve the following problem, i have the result, but i can get the way to arrive to it. This is the problem: There are 2 spheres of copper, separated at 1 meter, each sphere have a weight of 1 Kg initially. The problem want's to know how many electrons i need to transfer from...

I have the relevant equation, I just need to know the charges (in coloumbs) of the two ions so I can plug them into it. I thought that it would just be the equivalent charge of the one spare proton/electron, but that did not work so I guess it was a faulty assumption. I have not been able to...