Electrostatic Definition and 884 Threads

Hi! I have a high school physics question. I know the concept of induction, and I also know what happens when a dielectric slab is placed between 2 plates of a capacitor. 2 charged particles are kept at a distance r. The mutual force of attraction/repulsion is F. What happens to the force...

Homework Statement If there is a positively charged rod,which is placed near an aluminium foil,free electrons in the foil are pulled towards the rod.This makes the top end of the foil negative and leaves the bottom end short of electrons to become positive. I wonder if the rod has a very...

I have physics homework and came across this question : I was asked to find the electrostatic force between two charged particles each having a charge of +5.0x10-9 C and which were separated by a distance of 3cm. I found it to be 2.5x10-4 N.Then I was told to calculate the gravitational force...

Homework Statement Three vector fields are listed below. Determine whether each of them is electrostatic field or magnetic field.Homework Equations F1(x, y, z) = A (9yz ex + xz ey + xy ez) F2(r,∅,z) = A [(cosx/r)er + (sinx/r) e∅] F3(r,θ,∅) = Ar2 e(-r/a) erThe Attempt at a Solution Used matrix...

Homework Statement An electrostatic speaker is constructed using two conductive plates (stators) and an electrostatically charged diaphragm in the middle which vibrates. One of the conductors is grounded, and the other has an amplified voltage applied to it to drive the force. A uniform...

Working from Krane's Modern Physics 11.5 Calculate the first 3 contributions to the electrostatic potential energy of an ion in the CsCl lattice. I believe the formula I'm supposed to use is U_{c}\,=\,-\alpha\frac{e^{2}}{4\pi\epsilon_{0}R} Just from looking in the chapter I can...

Hello All, I have an arcane curiosity that cannot be answered anywhere I look (including Griffiths' intro electrodynamics book and the internet). This question seems so simple but I may just be over-thinking it. If there are two square, parallel, finite, conducting plates and a point...

I was wondering, what is the distinction made with problems involving either conductors or insulators with electrostatic problems. Is it that the electric field in an insulator doesn't have to be zero, whereas the electric field in a conductor is always 0?

Homework Statement A thin, square, conducting plate 50.0 cm on a side lies in the xy plane. A total charge of 4.00 x 10-8 C is placed on the plate. Find (a) the charge density on each face of the plate, (b) the electric field just above the plate, and (c) the electric field just below the...

Hello, (this isn't homework but I thought it wasn't worthy of the main forums) I'm looking to clarify some thoughts about the various forms of electrostatic potential energy. As I understand, the expression \displaystyle \frac{\epsilon_{o}}{2} \int \textbf{E} \cdot \textbf{E} \; dV over all...

Imagine nine vertical and parallel lines drawn side by side. They represent infinite planes of uniform voltage. The first line has 0 V. The 2nd line has 1 V. The 3rd has 2 V and so on, with the 9th line having 8 V. The distance between each line is 1 cm, which is 0.01 meter. There is an...

Homework Statement Suppose that the magnitude of the net electrostatic force exerted on the point charge q2 in the figure is 0.65 N . (Figure 1) http://imgur.com/4lZliPq Find the distance D. q1 = 2.1 micro C q2 = 6.3 micro C q3 = -.89 micro C Homework Equations F = k |q1|...

Hi everyone: I am rookie in classical physics and first-time PF user so please forgive me if I am making mistakes here. My current project needs some guidance from physics and I am describing the problem, my understanding and question as below. I have an independent electrostatic system...

Homework Statement Obtain an expression for the potiential energy between to particles in an ionic bond at radius r0 Homework Equations Coloumb's laws: F = (-k * q1 * q2)/r-1The Attempt at a Solution I think that if i do U = r0∫0 F(r)dr = [k * q1 * q2 * r-1]r00 = k * q1 * q2 * r0-1, Then that's...

A conducting spherical shell of radius 11.0 cm is charged to a potential of 5.00*10^4 V. What is the value of the electrostatic potential 5.0 cm outside the surface of the sphere? V=(1/[4*pi*(epsilon naught)])*(Q/r) <-- outside of the shell V=(1/[4*pi*(epsilon naught)])*(3Q/2R) <-- inside...

From this link: http://www.chemguide.co.uk/atoms/structures/ionicstruct.html it explains why NaCl has a 6:6 coordinated structure and not an 8:8 coordinated structure. However, i don't really understand their explanation "Now imagine what would happen if you replaced the caesium ion with the...

I'm tasked to find the force one parallel plate exert on the other plate in a capacitor. somehow the force isn't just F=qE, where E=Q/2εA What am I missing here?

Can one transmit electrons to create an electrostatic charge through electrostatic induction? Can one use a gas to create an electrostatic charge in an item by moving the air next to it? If either of these are true, would it then be possible to create an effecient (I.E. one without...

Homework Statement A 8.15 nC charge is located 1.95 m from a 4.18 nC point charge. (a) Find the magnitude of the electrostatic force that one charge exerts on the other. N (b) Is the force attractive or repulsive? Homework Equations The Attempt at a Solution Is there really a...

I'm getting a bit confused as to what each force refers to. Correct me if I am wrong, Intermolecular forces (also referred to as electrostatic forces), are forces that exist between molecules. These forces can very in strength, strongest in liquids, relatively weaker in liquids, and almost...

Homework Statement It's given that absolute permitivity is a coordinate function: ε (x, y, z) = Asin(x)cos(y), where A=const Homework Equations We need to find an electrostatic field potential function \varphi in Cartesian coordinate system. The Attempt at a Solution I tired to solve, but...

I'm trying to think about what it is I should be considering before I start throwing up some maths. I'm thinking to assume that the positively charged core is a point charge +e and the electron is uniformly distributed over a sphere of radius Rs. The self energy of the electron...

1. Similarities and differences between magnetic and electrostatic experiments can include: 2. What are there factors individually and then decifer 3. Similar- both have positive 'and/or' negative charges. Differences- electrostatic must involve an imbalance of positive or...

Homework Statement The diagram shows two charges, +4 μC and –16 μC, 120 mm apart. What is the distance from the +4 μC charge to the point between the two charges where the resultant electric potential is zero? A 24mm B 40mm C 80mm D 96mm Homework Equations potential equation...

I'm confused about this because voltage or potential difference is defined as work done by an external source in moving a unit charge from one point to another in an electric field. However, in circuit analysis things seem to be different because we measure voltage from V=IR. I want to...

So I was reading my textbook and it says that we are given a situation where two particles of the same charge are separated by the distance 0.0200m. Another particle of the opposite charge is then placed in between the other two particles, 3/4 the distance mentioned away from one and thus 1/4...

Homework Statement Homework Equations work = kqqq/(distance) The Attempt at a Solution http://i33.photobucket.com/albums/d86/warnexus/electrodiag.jpg

Homework Statement An atom H has a charge +q (=proton) and -q(=electron). q = 1,6.10^-19. The electron is circeling around the proton at r distance r = 0,53.10^-10m. What is the force as a result of the electrostatic interaction between the proton and electron Homework Equations...

Homework Statement Determine if the following diagrams may describe an electrostatic field in a charge-free space. The rectangles are the spaces under consideration. In the first four diagrams there are field lines while in the last two there are equipotential lines Homework Equations...

Homework Statement http://img842.imageshack.us/img842/2816/unavngivettz.png My problem is that I'm confused about a hint I was given in this problem. I usually use the law of cosine to find the length of \vec{r}-\vec{r'} in sphere problems. But the hint I have says that I should make it...

I'm curious about electron trapping by electrostatic force. A simple scenario can be ... A perforated, conductive, hollow sphere in a vacuum, connected to a negative high voltage source. I want to calculate how much electrons it can hold (total charge of it). The relation between sphere voltage...

Homework Statement One type of ink-jet printer, called an electrostatic ink-jet printer, forms letters by using deflecting electrodes to steer charged ink drops up and down vertically as the ink jet sweeps horizontally across the page. The ink jet forms 30-μm-diameter drops of ink, charged...

Homework Statement Consider a sphere conductor with a inner concentric sphere cavity. The radius of the inside and outside of sphere are 10 cm and 20 cm. The electric field in a point P, along the outer surface has a intensity of 450 N/C and it is directed out of the surface. When a particle...

Homework Statement Determine the electrostatic energy, W, of a spherical shell of radius R with total charge q, uniformly distributed. Compute it with the following methods: a) Calculate the potential V in spherical shell and calculate the energy with the equation: W = (1/2) * ∫σVda...

Homework Statement I'm solving a problem where a conducting pipe with a square cross section is being analyzed to find the potential everywhere in space. The pipe lays along the z-axis, so we're really concerned with the x-y plane. My issue isn't so much the general solution via separation...

Homework Statement Determine the total electrostatic potential energy of a nonconducting sphere of radius r0 carrying a total charge Q distributed uniformly throughout its volume. Express your answer in terms of the variables Q, r0, and appropriate constants. Homework Equations V = kQ/r...

i'm trying to understand how the electrosatic potential expressed as an integral satisfies poisson's equation. i know that i have to take the laplacian of both sides of (Eq 1.17) page 35 in Jackson. i understood how jackson took the laplacian of \frac{1}{\sqrt{r^2 + a^2}} but after Eq 1.30...

Homework Statement What is the electric field at the third vertex. http://tinypic.com/r/350toif/6 edit- not working actual link works = http://tinypic.com/r/350toif/6 Homework Equations E=kq/r^2 The Attempt at a Solution E1= (labeled on the diagram) = (8.99*10^9)(4)/(.02)^2 =...

hello! "there is a high computational expense associated with calculating the local electrostatic field [in molecular modeling and simulation]" why? what is exactly the problem? thanks!

Homework Statement Compare the electrostatic energy of two opposite charges e and -e, a distance 7 angstroms apart in water at room temperature and that in vacuum (express the energy in terms of Bjerrum length) Homework Equations E = 1/(4(p\pi\epsilonD)*(-e^2)/r^2 ? The Attempt at a...

Homework Statement Charge A is +2C and is located at <4,0,0> Charge B is +12.5C and is located at <0,-3,0> What is the the Force(AonB) What is the magnitude of F(AonB) Homework Equations F = (k)(Qa)(Qb)/(r^2) (r^) For reference the answers are < -0.8k, 0.6k, 0 > N (F...

Homework Statement There is a charge q, at a distance d from an infinite conducting plane (z=0). Determine the electrostatic potential drop between the z=0 and z=d. Homework Equations Ohm's Law DeltaV=-integral (E.dl) The Attempt at a Solution I know how to do this problem...

Homework Statement Compute, in the following two ways, the electrostatic energy W of the uniformly charged solid sphere of radius a (charge density \rho) that is surrounded concentrically by a uniformly charged thin spherical shell of radius b (surface charge density \sigma), where the...

G'day, I've got a little robotics project that I'm working on, and I've been thinking of adding a little electro-static adhesion gripper to it. This gripper will used to pick up an aluminium softdrink can (300ml I think), which weighs 100gm. At the moment, I don't care what it can pick up...

Hello, Any help woould be wonderful! Identical point charges Q are placed at each of the four corners of a rectangle measuring 2.35 m by 3.05 m. If Q = 26.9 μC, what is the magnitude of the electrostatic force on anyone of the charges? i don't even know where to start... HELP!

hello! which equation descripts the electrostatic interaction between two non-point (ie. that have dimensions) charged particles? thanks!

If I have a sphere with radius R which has a charge distribution given by \rho(r)=\frac{5Q}{\pi R^{5}}r(r-R) and \rho = 0 at r bigger or equal to R, how do I find the electrostatic potential of this overall space? There is a charge Q, in addition, at the origin. My original thought...

Hi, What is the charge on a droplet of paint? Im trying to understand what's going on in electrostatic spray painting - specifically at the spray nozzle (this could also be crop spraying too) My understanding so far is that a paint supply is fed into a grounded nozzle. An electrode...

Homework Statement I should derive \vec{F_{q}} = \frac{-q'^{2}}{4∏ \epsilon_{0}} \frac{r'/a}{(r'^{2} - a^{2})} \hat{r} from \vec{F_{q''q'}} = k\frac{q' q''}{\left|\vec{x'} - \vec{x''}\right|^{2}} Homework Equations The Attempt at a Solution I know that q'' = -q'...

Homework Statement Use Green's Reciprocation Theorem to show the G.S to the Electrostatic PotentialHomework Equations Green's Reciprocation Theorem \int_{v} \rho^{'} \Phi d^{3}x + \int_{s} \sigma^{'} \Phi da = \int_{v} \rho \Phi^{'} d^{3}x + \int_{s} \sigma \Phi^{'} da The...