Electrostatic Definition and 857 Threads

Homework Statement A charge Q is at the origin. A second charge, Qx = 2Q, is brought to the point x = a and y = 0. A third charge Qy is brought to the point x = 0, y = a. If it takes twice as much work to bring in Qy as it did Qx, what is Qy in terms of Q? Homework Equations My main problem...

Homework Statement A metal sphere with a negative charge of 3.00x10^-6C is placed 12.0 cm from another similar metal sphere with a positive charge of 2.00x10^-6C. The two spheres momentarily touch, then return to their original positions. Calculate the electrostatic force acting on the two...

Hey, In my physics we derived certain properties of conductors in electrostatic equilibrium using Gauss' law. One property seemed to "mathematical" to me. It says that the whole charge of a conductor in electrostatic equilibrium is located at the surface. The proof is at follows. Since the...

1. Explain what is meant by statement that electrostatic forces obey the principle of superposition? 2. what does it mean to say that physical quantityis (a) quantized or (b) conserved.

Homework Statement A 1.4*10-9 C charge is on the x-axis at x = -2.0 m, a 7.0*10-9 C charge is on the x-axis at x = 2.5 m. Find the net force exerted on a 4.0*10-9 C charge located at the origin. Homework Equations F=k(q1*q2) / (r^2) k= 9*10^9 The Attempt at a Solution I simply...

Why do electrostatic experiments not work well on humid days?

[SOLVED] Electrostatic Force Homework Statement The dipole moment of the water molecule H2O is 6.17x10^-30 Cm. Consider a water molecule located at the origin whose dipole moment p_vec points in the positive x direction. A chlorine ion (Cl-), of charge -1.60x10^-19 C, is located at...

i have question, if A 2.00 mm-diameter copper ball is charged to + 70.0 nC. What fraction of its electrons have been removed? I know i have to use the relation, q = (Nprotons - Neletrons)e, but i can't figure out the answer. what does e stand for. please help thankyou

Dear Alls, I need your advice regarding my experiment in producing the High Voltage Zero Current, Pure Electrostatic device. The Input Power/Voltage: 5 Watt/220 Volt The Output Voltage shall be 20.000 Volt The Output Current shall be 0 Micro Ampere. Please assist me in step by step...

I am having some trouble getting started with this problem. Do I want to use kq/r^2 at all or should I be doing something else? The problem is: Two point charges, Q1=-6.7 microCoulombs and Q2= 1.3 microcoulombs, are located between two oppositely charged plates. (The positively charged...

The dipole moment of the water molecule ({\rm H}_{2}{\rm O}) is 6.17 \times 10^{-30}\;{\rm C \cdot m}. Consider a water molecule located at the origin whose dipole moment p_vec points in the positive x direction. A chlorine ion ({\rm Cl}^{-}), of charge -1.60 \times 10^{-19}\;{\rm C}, is located...

[SOLVED] Electrostatic Force Homework Statement One model of the structure of the hydrogen atom consists of a stationary proton with an electron moving in a circular path around it.The orbital path has a radius of 5.3x10^-11m. The masses of a proton and an electron are 1.67x10^-27kg and...

hi i don't know if this has been posted or not but i am sort fo stuck on this one What is the force F_vec on the 1 nC charge at the bottom? View Figure Write your answer as two vector components, separated by a comma. Express each component numerically, in Newtons, to three significant...

Homework Statement 1. Four charged particles are held fixed at the corners of a square of side s. All the charges have the same magnitude Q, but two are positive and two are negative. In Arrangement 1, shown below, charges of the same sign are at opposite corners. Express your answers to...

I heard that one can solve 2D problem with conformal mapping of complex numbers. Is it possible to use this method for 3D axial-rotationally symmetric problems (which are effectively 2D with a new term in the differential equation)?

Does anyone know of an experiment that shows that the electrostatic and/or magnetostatic forces have a finite speed, i.e. transmission time? I think I remember reading somewhere that Hertz devised experiments that showed that one or the other or both effects had a finite transmission time. In...

I am looking some help on applying the well known formula of the electrostatic force between two parallel capacitor plates on charged surfaces which have non usual shapes. My approach is to break apart the total surface into segments with common shapes and calculating the force between each two...

Hello, first post here. I hope this is in the right section. I have spent an hour or so surfing the net and could not figure this out (i am bad at physics). How do you figure out the electrostatic force attracting two plates? The plates are 2sq/m, have a 0.006m spacing, and have 10000 volts...

Homework Statement (Objective type question) Consider a square ABCD of side a, with charges +q, -q, +q, -q placed at the vertices, A, B, C, D in a clockwise manner. The electrostatic potential at some point located at distances r(r>>a) is proportional to? Homework Equations V...

find electrostatic force problem: there's a long straight wire with a λ1 charge. at some distance from it there's a bar charged with a λ2 charge. the bar is not parallel to the straight wire, instead it's inclined with an angle "alpha" between the dotted line, parallel to the wire, passing...

How does the exchange of photons/virtual photons give rise to the electrostatic or electromagnetic force? Why do like charges repel and opposite charges attract?

Rub a balloon containing a few pieces of Styrofoam towards your sweater or a piece of wool/fur. What do you observe when you touch with your finger one of the piece through the balloon? Why does this happen? The Styrofoam repels within the balloon. You charge the balloon negative by rubbing...

Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of 0.0864 N when their center-to-center separation is 70.6 cm. The spheres are then connected by a thin conducting wire. When the wire is removed, the spheres repel each other with an electrostatic...

Homework Statement Lab: rub each of a set of hard materials against a set of soft materials. Hold the hard materials near a suspended, negatively charged comb (wool rubbed) to determine the charge polarity and strength on the hard item. Create a list of the hard and soft items used in order...

Hi! we did a lab where we charged a big sphere with 5kV, with this sphere we then charged another smaller sphere that was hanging loose from a string by touching it. We had to measure the distance the small sphere moved from its initial position and also the distance from the big sphere to the...

Homework Statement Find an expression for the electrostatic self-energy of an arbitrary spherically symmetric charge density distribution p(r). You may not assume that p(r) represents any point charge, or that it is constant, or that it is piecewise constant, or that it does or does not cut...

Find an expression for the electrostatic self-energy of an arbitrary spherically symmetric charge density distribution p(r). You may not assume that p(r) represents any point charge, or that it is constant, or that it is piecewise constant, or that it does or does not cut off at any finite...

Hi Friends, I was thinking of having a either a point charge or some amount of charge at the center(let us say positive charge) and having a hollow concentric sphere( a conductor) around it. Now, there will be induced charge on the inside of hollow sphere and accordingly opposite charge...

What a great forum. I'm prototyping a small hand-held 110V tool. I need to add an electrostatic discharge function to it. We have all seen the "Ionic filter" devices at Sharper Image, where the plates will charge and attract dust. This is the opposite functionality - I need to push dust...

Hi I cannot get this problem for the life of me and I have no idea why Four charges q1 = q3 = -q and q2 = q4 = +q, where q = 5 µC, are fixed at the corners of a square with sides a = 1.3 m Calculate the x- and y-components of the net electric field at the midpoint M of the bottom side of...

Homework Statement Three charges are fixed to an x, y coordinate system. A charge of +18 µC is on the y-axis at y = +3.0 m. A charge of -16 µC is at the origin. Lastly, a charge of +45 µC is on the x-axis at x = +3.0 m. Determine the magnitude and direction of the net electrostatic force on...

I have about a year of electronics background, but what I'm trying to make is still a bit daunting for me. I want to build a device that creates a very high voltage electrostatic field like a van de graff generator and then input to this field variable frequencies from an electric keyboard...

Some teacher told me this If we have hollow sphere (of conducting material) with some thickness. and if we place a +ve charge inside that . -ve charge induces on inner surfuce, Which further causes in outer sphere & that becomes positivly charged. is this right? Please give right explanation.

I just came across Earnshaw's Theorem which states: A charged particle cannot be held in stable equilibrium by electrostatic forces alone. As an example it said that equal and fixed point charges at the corners of a cube could not hold stationary a point charge at the center. There was...

TITLE: Hard Electric Charge Problem. Homework Statement 15. The charges and coordinates of two charged particles held fixed in an xy plane are q_{1} = +3.0 \muC, x_{1} = 3.5 cm, y_{1} = 0.50 cm, and q_{2} = -4.0 \muC, x_{2} = -2.0 cm, y_{2} = 1.5 cm. Find the (a) magnitude and (b)...

hi... actually, i got dust under my ipod screen,,, I've been searching for was to remove it without getting it naked... so i thought of electrostatic induction... i thought that, rbbing a pen with my hairs and then approaching it to my screen, the dust particles would be moving at least...

*Thanks for the help*

Homework Statement Basically I am given an image showing a test charge tied to a string where there is the ball is stationary. I need to use the fact that there is no net force on the ball to derive an equation for the electrostatic force in terms of g, the angle, and the mass of the ball...

Usually, in textile industry, the important issue is to discharge the yarns from any electrostatic charges that might be stuck on it due to friction or other factors. What I need is completely the opposite; I want to put, on a yarn, electrostatic charges strong enough to make the yarn stuck on a...

i don't quite understand the derivation of mutual electrostatic energy of two charged system: U_12=\frac{1}{4\pi}\intE_1(dot)E_2dV=-\frac{1}{4\pi}\intE_1(dot)\nebla\phi_2 dV= \frac{1}{4\pi}\int \phi_2(dot)\nebla(dot)E_1=\int \phi_2*\rho_1dV i undersantd that we are using here...

Three charges are fixed to an xy coordinate system. A charge of +14 uC is on the y-axis at y= +3 m. A charge of -14 uC is at the origin. Lastly a charge of +47 is on the x-axis at x= +3 m. Determine the magnitude and direction of the net electrostatic force on the charge at x= +3 m. Specify...

I came across this by accident. http://amasci.com/weird/unusual/e-wall.html. David Swenson of 3M Corporation describes an anomaly where workers encountered a strange "invisible wall" in the area under a fast-moving sheet of electrically charged polypropelene film in a factory. This...

I have a metal sphere with the net charge q. And I'm trying to calculate the force that southern hemisphere exerts to northern hemisphere... and I get 0. now, the electrostatic "pressure" is \mathbf f = \sigma \mathbf E = (q/4\pi R^2) (q/4\pi \epsilon_0 r^2) \mathbf {e_r} due to the symmetry...

I tried to do a post here but it didn't take so I'm going to put something much shorter that asks the same thing. I tried to calculate the electric field produced by a sphere of uniform charge using this formula: E(r)=\frac{1}{4\pi\epsilon_0} \iiint\rho(r') \frac{r-r'}{|r-r'|^3} d^3r' I...

I need to find the electrostatic force & the number of elementary particles between two charged balloons held in the center of their strings (Think of an Isosceles Triangle). Homework Statement Mpurple(balloon) - .00354 kg Mred - .00405 kg Lpurple - .725 m Lred - .68 m θ = 16° T =...

Two concentric metal spheres have radii r_1 = 10 cm and r_2 = 10.5 cm. The inner sphere has a charge of Q = 5 nC spread uniformly on its surface, and the outer sphere has charge -Q on its surface. (a) calculate the total energy stored in the electric field inside the spheres Hint: You can treat...

Homework Statement Calculate the X, Y, and magnitude force between the two charges. Compare to the computer simulation results. Homework Equations Do not forget that this is a 2-D problem. Use the 2-D Coulomb’s law for line charges. The Attempt at a Solution Basically we used a...

Homework Statement Two uniformly charged spheres are firmly fastened to and electrically insulated from frictionless pucks on an air table. The charge on sphere 2 is three times that on sphere 1. Which force diagram correctly shows the magnitude and direction of the electrostatic forces...

if a charged particle ic located inside a shell of uniform charge there is no net electrostatic force on the particle from the shell. 1st is this fact? 2nd if it is so please explane it to because there is some distance between the particle and other chargeds in shell every one has different...

Question - Three charges lie along the x acis as shown below. The negative charge q1 = 25 uC is at x = 2.0 m, the negative charge q2 = 6.0 uC is at the origin. Where must a positive charge q3 be placed on the x-axis such that the resultant force on it is zero? Answer - I was thinking the...