Electrostatic Definition and 884 Threads

Homework Statement I am trying to help a friends daughter understand her physics homework. We have been stumped for hours! We don't really understand what her teacher was talking about and what we have figured out has mostly come from google. The problem is (this is drawn out no real...

The Dirac electron in the Higgs vacuum field v and an electromagnetic field with vector potential A_\mu is described by the following equation: i \gamma^\mu \partial_\mu \psi = g v \psi + e \gamma_\mu A^\mu \psi where g is the coupling constant to the Higgs field and e is the coupling...

Homework Statement At the surface of a conductor the potential is constant .. I can't get my head around this .. Homework Equations E=-grad VThe Attempt at a Solution The only reason I can think about this is Electric field is perpendicular at the surface , hence no work is done when moving...

Homework Statement At the point of fission, a nucleus with 98 protons is divided into two smaller spheres, each with 49 protons and a radius of 6.38x10^-15 m. What is the repulsive force pushing these two spheres apart Hint: d ≠ the radius Homework Equations F= k (q1q2/d^2) The...

here is what I am doing. I am trying to argue that the electric field is zero at the center of the sheet using only symmetry arguments. consider an insulator in the shape of infinite sheet of thickness 2a and with uniform charge density \rho. Now let me specify the coordinate system. The...

Somewhat of a rudimentary question. Not sure it belongs in the QM forum-----2 electrons--one on left----one on right----1 cm apart. A repulsive force exists betw the two. Now a 3rd electron is brought in on left. Will this increase the repulsive force on the electron on the right----or to feel...

Homework Statement I am trying to follow a derivation in Jackson - Classical ElectrodynamicsHomework Equations In equation 1.58 (2nd/3rd edition) of Jackson - Classical Electrodynamics he says that by using the fact that \mathbf{\rho} \cdot (\mathbf{\rho} +\mathbf{n})/ | \mathbf{\rho +n|}^{3}...

Fun Fly Stick is a toy to generate electrostatic energy, please see an attached image. I am insulated from the floor and the stick is touching the metal wall, the longer I operate it, should my body get more negative charges or less? " ... An electron has a mass that is...

If i have an arbitrary vector field, say F = constant / (x^2 + y^2 +z^2) I want to determine if it is electrostatic or not. For this I am thinking I should first determine if it is a conservative field, but not 100% sure, any guidance would be appreciated :) mitch

Battery has positive and negative charges, will it be possible to generate electrostatic energy to my body by touching either sides of battery? Thanks in advance for any suggestions

Homework Statement An unknown charge and a charge of 60 nC are 2.0m apart. The electric field strength is zero at a point 0.80m from the unknown charge on a line connecting the two charges. Find the magnitutde of the unknown charge. Homework Equations q=F/E F=kq1q1/r^2 E=kq/r^2...

When I play with my cat, there is some electrostatic energy generating between my hands and cat's fur, does anyone have any suggestions whether my body get positive charges after playing with my cat or negative charges? Thanks in advance for any suggestions

(Not sure if this should go in SR/GR forum) I watched a Susskind lecture last week in which he was discussing the fundamental law of charge conservation. He used the example of an electrostatic field surrounding a point charge, and stated that, were we able to suddenly make the charge...

I was watching a show the other night about the Large Hadron Collider, and I got to wondering how much force it would take to push two uranium nuclei right up against each other. I figured it would be on the order of a thousandth, maybe a millionth of a pound, which seems like a lot, considering...

Homework Statement The charge distribution of an atomic nucleus is modeled by the Gaussian distribution: p(r) = A exp(-r2/a2) Obtain the Fourier transform of p(r), and use the result to obtin an expression for the potential as a Fourier integral. Homework Equations Fourier transform and...

At a certain distance from a point charge q there is small, dielectric ball. How would change the value of electrostatic force acting on the ball, if the value of a point charge would be doubled? According to F=k[(q1*q1)/r^2] there would be no force on the dielectric ball, because his resultant...

When you use a pull-down resistor (resistor to ground) between a switch and a gate to prevent floating, why does the supply go past the pull-down but electrostatic voltage through the pull-down? Shouldn't it just go through whichever one has less resistance? Is there some kind of 'bandwidth...

Homework Statement Electrostatic precipitators use electric forces to remove pollutant particles from smoke, in particular in the smokestacks of coal-burning power plants. One form of precipitator consists of a vertical, hollow, metal cylinder with a thin wire, insulated from the cylinder...

Hi, Is there any way to analytically calculate the perturbation of a uniform electrostatic field by a dielectric cube. I know a solution exists for dielectric spheres but I haven't been able to come across the solution, when dealing with a cube. Ohh.. and I'm assuming the simplest case...

Homework Statement particle 1 of charge q1 (at origin) and particle 2 of charge q2 = 3q1, are held at separation L on an x axis. If particle 3 of unknown charge q3 is to be located such that the net electrostatic force on it from particles 1 and 2 is zero, what must be the (a) x and (b) y...

In solid sodium chloride (table salt), chloride ions have one more electron than they have protons, and sodium ions have one more proton than they have electrons. These ions are separated at about 0.28 nm. Calculate the electrostatic force between the sodium ion and the chloride ion. What I...

Homework Statement An electric point charge of Q1 = 5.23 nC is placed at the origin of the real axis. Another point charge of Q2 = 1.89 nC is placed at a position of p = 2.63 m on the real axis. At which position can a third point charge of q = -2.62 nC be placed so that the net...

I started an electrical engineering degree this semester. My book says that electrostatic noise meaningfully affects analog but not digital. But it does not say what electrostatic noise is, and neither Google nor Wikipedia readily yield an answer to this question: What is electrostatic noise?

Homework Statement For two concentric conducting spheres (radius a and b, b>a) that form a capacitor with charge q on the inner sphere and -q on the outer sphere, express the electrostatic energy in terms of q and -q and the potential difference between them.Homework Equations Gauss's Law, the...

In the figure, the net electrostatic force on Q1 is zero. If Q1 = +4.99 nC, determine the magnitude of Qo. Qo = (r0/r1)^2 * abs(q)*2cos theta The figure is attached, please help, I'm so lost with physics II

There is one point I am unclear upon in terms of indued charges. If a charge is induced by another charge, will the potential from the induced charge have an effect on the inducing charge. It seems that if it were the case you would be getting (increasing) energy from nothing, however if it...

Homework Statement A charge of 6.00 x 10-9C and a charge of -3.00 x 10-9C are separated by a distance of 60.0 cm. Find the position at which a third charge, of 12.0 x 10-9C, can be placed so that the net electrostatic force on it is zero. Homework Equations Coulomb's Law The...

Homework Statement Three charges are arranged as shown in the picture I attached. Find the magnitude and direction of the electrostatic force on the charge at the origin.Homework Equations I know that Coulomb's Law must be applied.The Attempt at a Solution I've drawn a force diagram with FCB...

Homework Statement Two particles lie on the x axis. The first particle is at the origin with a charge of +1.6uC and the other has a charge of -3.1uC and is +10.5cm away. If particle 3 of unknown charge q3 is to be located such that the net electrostatic force on it from particles 1 and 2...

Hello everyone. So that is my question: What does the energy of an electrostatic field mean? A more detailed description of my background or understanding will help you to provide an answer: The process to deduce such a thing is usually calculate the work done in order to bring charge...

Homework Statement Two particles with positive charges q1 and q2 are separated by a distance s. Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? Homework Equations E = kq/r2 where k = 1/(4 x pi x...

My textbook says that Electrostatic potential is the work done on a unit charge to bring it from infinity to a point from a given charge without acceleration, against the electric field presend due to the given charge. So, as it says that there will be no acceleration, does it imply that...

I have a little trouble solving Electrostatic problems (at undergraduate level) that involve volume or surface integrals when there are normal vectors involved, and one must (normally) dot this with a vector field (such as electric field) when one cannot use Gauss's law. one such example I...

Homework Statement Two identical conducting spheres, with a radius of 15.0 cm, are separated by a distance of 10 m. What is the charge in each sphere, if the potential of one sphere is +1500 V, and the potential of the other one is -1500 V? Which assumptions did you make? Homework Equations...

This is actually a question pertaining to a paper I'm trying to understand (PRB 73, 115407 (2006)), but I decided to put it here just to be safe. Homework Statement The paper I'm reading involves starting with an electrostatic energy contribution, and rewriting it with a green's function...

I've been thinking about this for a while, and I think people of PF will be able to answer it haha In parallel plate capacitor, we charge the capacitor by connecting a power supply/battery. Then, after few minutes, the capacitor is fully charged with different signs, + and -. With that...

The concept of volume charge density is an even distribution of charge over a three dimensional area. C/m^3. However, the concept of electrostatic equilibrium says that all of a conductors charge lies on the surface of the conductor. The existence of one seems, to me at least, to render the...

Homework Statement In solid sodium chloride (table salt), chloride ions have one more electron than they have protons, and sodium ions have one more proton than they have electrons. These ions are separated by about 0.28 nm. Calculate the electrostatic force between a sodium ion and a chloride...

Homework Statement Two discs are each charged +q. A third metal disc of radius R∗ > 5 cm is carefully inserted between the two discs; the third disc is neutral and is suspended by an electrically insulating thread. The three discs are all parallel to each other and their centers lie along the...

I understand that the electrostatic field around a charged particle contributes to its mass. It is as though there is a cloud of mass/energy centred on the charged particle that travels with it contributing to its inertia. I have found that the mass/energy of this cloud can be enhanced by...

given to solid half charged sphere Insulators. In which state the mutual net force is bigger: A/B/the same

Homework Statement The problem is: If you have 2 rectangular plates 1cmx10cm each, which means that the area is A=10cm2=10-3m2for each plate; every plate holds a Constant positive charge of Q=+2x10-6C each; these plates are separated by a distance d=1cm=10-2m What is the electrostatic...

I have some problems withe this question: Two positively charged particles A and B of masses of mA and mB respectively are suspended by two insulating threads of the same length from O. Due to the electrostatic repulsive force between A and B, threads from AO and BO make 30 degrees and 60...

what is the influence of electrostatic on water ?

At the two ends of a pole there are two + charged spheres.One has a charge n times that of the other (nq and q). Along this pole, of length we will call d, there is another charged sphere which is located at an equilibrium position we will call x units away from the first sphere. My task is to...

Homework Statement Protons are bring accelerated through a potiential difference of 5.00 x 10^3 V in the gun of a particle accelerator. They must pass between two parallel deflecting plates that are 6.0 x 10^-2 m long and 2.0 x 10^-2 m apart with a potiential difference between them of 1.50...

Say there is are three hypothetical infinite parallel planes with charges on it. So let's imagine the three planes from left to right, or planes one, two and three. Plane-three is fixed to the reference frame. Plane-one and plane-two have a fixed separation distance between each other, but...

Homework Statement if the separation between the plates of an isolated charged parallel-capactior is increased, why does the stored electrostatic energy increase? Homework Equations C=eA/d e= permitivity of space The Attempt at a Solution i do not know the equation of...

Homework Statement http://img832.imageshack.us/img832/17/unledqp.png Above is the problem and the solutions The Attempt at a Solution Now I really have problems with how the factors of the radius is in there. I did it differently This is how I did it \sum W_{ab} = \Delta K \int...