Electrostatic Definition and 857 Threads

The other day I ran across a writeup for a general physics experiment (it might have come out of a high school AP course - I'm not sure) about using charged Scotch tape to separate charges for the purpose of measuring the charge through a torque equilibrium setup. The technique was to put a...

Homework Statement (Part 1) A hoop of charge of radius k lies in the y, z plane, centred on the x axis, so that it occupies the points (0, y, z) with y^2 + z^2 = k^2. If the (linear) charge density in the hoop is j, calculate the electrostatic potential Fi at all points on the x axis, and...

Homework Statement Four particles form a square. The charges are q_1 = q_4 = Q and q_2 = q_3 = q. (a) What is \frac Qq if the net electrostatic force on particles 1 and 4 is zero? (b) Is there any value of q that makes the net electrostatic force on each of the four particles 0...

Electrostatic forces helpp! Homework Statement Two spheres, each having a mass of 50.0 mg, are suspended from a common point by massless threads 50.0 cm long. One of the spheres have been given a charge twice that of the other. The strings make an angle of 6.00 degrees. What are the charges...

Homework Statement Show that all longitudinal waves must be electrostatic by using Faraday's law. Homework Equations Faraday's law: \frac{\partial \vec{B}}{\partial t} = - \nabla \times \vec{E} The Attempt at a Solution Where should I start??

Homework Statement This is just a thought experiment and I wanted to know if my answer is correct. If I... 1) Tie a string to one of the plastic combs and suspend this comb from the edge of a table 2) Then rub the suspended plastic comb in wool to give it a negative charge 3) and If I...

Homework Statement Consider the cross sections of two, very long, concentric, metallic, hollow cylinders placed in a vacuum. The small cylinder has inner radius A and outer radius B while the larger cylinder has inner radius 2A and outer radius 2B. Initially the small and big hollow...

I encountered a problem which goes like this: Two charges of mass m and charge q are initially positioned far from each other. Now one is projected towards the other with velocity v . Find the closest distance of approach. We( in class) solved the problem using energy conservation but I...

The original web http://farside.ph.utexas.edu/teaching/em/lectures/node56.html Reading the web which is posted above I got a question ... I need some masters to help me! My question : why not to remain the left term of eq539 instead of eliminating it by "Let us...

Two point-like objects carry charges of q1 = +4C and q2 = -3C and are separated by a fixed distance of 50 cm. (a) Determine the point (other than infinity) at which a point-like positive charge will experience zero net electrostatic force due to the two fixed charges. q1 = +4C ...... q2 =...

Consider an infinitely long stationary conductor which carries a steady uniform current. 1. At an arbitrary Test Point outside the conductor the Electric Field should be ZERO according to Maxwell's Equation. 2. But if Special theory of Relativity is considered, the moving charges...

How does ESD affect Aircraft and Aircraft Components?? Does anyone know?? Thanks...

1. All variables and given/known data: a = c = 1 \times 10^{-19} C b = 2 \times 10^{-19} C Distance between a&b = b&c = 0.1m (b at origin, a at (0, 0.1) and c at (0, -0.1)) 2. Homework Equations : F = k\frac{|q_1||q_2|}{r^2} 3. The problem that I'm having: Am I correct to...

Hi All, I am pretty new to COMSOL. I want design model of a sensor with four electrode. This sensor mainly based on impedance spectroscopy principle. The model should measure the distance and thickness of the obstacle due to change in capacitive impedance of electrostatic field between the...

1. A body will maintain a constant negative electrostatic charge if the body 1) Maintains the same excess of electrons. 3) Continuously receives more electrons than it loses. I chose 3) but I think both choices work. However, the correct answer is 1), I don’t why 3) is wrong. 2...

I have the problem and my work uploaded to this webpage. I believe I have the general idea down, but I'm just afraid that I've done a careless calculation and missed a minus sign somewhere. I feel that my results have a lot of negative signs, making the potential constantly negative. I'm not...

Homework Statement I have a solid, insulating, finite-thickness spherical shell (inner radius a, outer radius b). It's uniformly charged with a total charge of Q. I'm looking for the electric field E, "everywhere in space, including points outside and inside the spherical shell" Also...

why like charges repel n unlike charge attract each other?

Homework Statement Three charged particles form a triangle: particle 1 with charge Q1=80nC is at xy coordinates (0,3.00mm) particle 2 with charge q2 is at (0,-3.00mm) and particle 3 is at(4.00mm,0). In unit vector notation, what is the electrostatic force on particle 3 due to the other two...

Homework Statement A charge of -4.10 C is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.137 m). The charges on the circle are -3.58 C at the position due north and +6.79 C at the position due east. What is (a) the magnitude and...

The problem: Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of 0.158 N when their center-to-center separation is 63.2 cm. The spheres are then connected by a thin conducting wire. When the wire is removed, the spheres repel each other with an...

So I have this homework question that I answered already but still don't understand why the answer is correct. A positively charged ball is brought close to an electrically neutral isolated conductor. The conductor is then grounded while the ball is kept close. Is the conductor charged...

Homework Statement Three charges are arranged as shown in the figure. Figure (Attached Below Could not insert the image, wouldn't work for me) Find the magnitude of the electrostatic force on the charge at the origin. Answer in units of nN. What is the angle theta betwen the...

Homework Statement Of the charge Q initially on a tiny sphere, a portion q is to be transferred to a second, nearby sphere. Both spheres can be treated a particles. For what value of q/Q>0.5 will the electrostatic force between the two parts have 1/2 of the maximum possible value? The...

2 balls with a mass of 100kg are at a distance of 5m from one another, how many electrons need to be moved from one to the other in order to balance the gravitational force by an electric force, from what i understand, we have 2 neutral balls of the same mass, and i need to find out how much...

Hi, I've had a pretty good experience with physics forum in the past, so when I ran across something I couldn't find an answer to on the web, I figured why not ask it here.. I found a great introduction to electrostatic charge decay located at...

hey, i have a question from an exam paper which isn't worded too nicely (most of the questions on the exam are worded in similar ways ) The way I've done it is to first put in my first shell of infintesimal charge and then treat it as a point charge. Then i treat the next shell as just a point...

what is mean by "charge in an electrostatic equilibrium" ?? In my textbook the definition of the potential difference is that "The workdone on a unit positive charge carrying it from one point to the other kepping the charge in electrostatic equilibrium" In my textbook electrostatic mean...

I'm not sure whether to post this in the Mathematics or Physics forums, but I figure this problem is easily reduced to its transformation irrespective of the physics it describes. Consider a semi-infinite sheet of (infinitely thin) conductor charged to a potential V. It is placed at a distance...

I stumbled with this paper that propose the idea that gravity could possibly be an Electrostatic force. I am no physicist but I would like to know your points of view about it, since gravity is a puzzling force. http://www.aspden.org/arp/2005arp3.pdf I have also heard about some possible...

Does anyone have experience simulating MEMS (especially multi-coupled electrostatic analysis) in ANSYS that would answer a few questions.

Homework Statement The charges and coordinates of two charged particles held fixed in an xy plane are q1 = +3.5 µC, x1 = 1.5 cm, y1 = 0.50 cm, and q2 = -4.0 µC, x2 = -2.0 cm, y2 = 1.5 cm. (a) Find the magnitude of the electrostatic force on q2. Done I got this part = 94.98868N (b) Find the...

Homework Statement Two small, positively charged spheres have a combined charge of 5.4 x 10-5 C. If each sphere is repelled from the other by an electrostatic force of 1.04 N when the spheres are 2.2 m apart, what is the charge on sphere with the smaller charge? Homework Equations...

Homework Statement Hi all. A uniformly charged sphere centeren at (0,0,0) has a spherical hole inside and the hole has it's center at (d,0,0). Find the electric field inside the hole. The Attempt at a Solution I use superposition. The electric field from the sphere itself is trivial...

[SOLVED] electrostatic physics? Homework Statement a cabin contains only two small electrical appliances: a radio that requires 10 milliamperes of current at 9 volts and a clock that requires 20 milliamperes at 15 volts, a 15 volt battery with negligible internal resistance supples the...

[SOLVED] electrostatic force Homework Statement The figure shows an arrangement of four charged particles, with angle θ = 33.0 ˚ and distance d = 3.00 cm. Particle 2 has charge q2 = 8.00 × 10-19 C; particles 3 and 4 have charges q3 = q4 = -1.60 × 10-19 C. What is the distance D between the...

I've been studying basic atomic structure-- shells, subshells, orbitals, the four quantum numbers, the periodic table, etc. I've seen diagrams of "atomic structure" that show arrangements of electrons: 1s2, 2p2, 2p6 etc. and I understand how the configurations are derived from the quantum...

I've been studying basic atomic structure-- shells, subshells, orbitals, the four quantum numbers, the periodic table, etc. This is in a chemistry book, but if my question belongs in the physics forum please let me know. I've seen diagrams of "atomic structure" that show arrangements of...

[SOLVED] Electrostatic Forces on Particles "An Astatine 219 nucleus and an alpha particle at a spacing of 1.5 x 10^-15 m are formed during alpha decay. If the initial velocity of the two particles is zero, calculate the ratio of their velocities." I was thinking of making a ratio of their...

All right, I was just wandering about something. First, when we have a electric generator, than the rotor in it will rotate easily until current is drawn from it, correct? In other words, counter torque won't be produced until current is drawn. If this isn't true, than just stop reading the...

Hi, I'm having a little trouble understanding why the field inside a charged conductor must be zero. I understand that when the charge is put on the conductor, they spread out to the surface such that the surface becomes an equipotential. But why does that mean the field inside must be zero?

Any knows how electrostatic levitation works? I know it is the process of using an electrostatic field to lift a charged object, but how does it work? what goes on in the atoms in the dust and with the electric field?

Homework Statement A point charge with charge q1 is held stationary at the origin. A second point charge with charge q2 moves from the point (x1, 0) to the point (x2,y2). How much work W is done by the electrostatic force on the moving point charge? Express answer in joules. Use k for...

Homework Statement Three point charges are located at the corner of an equilateral triangle. The Coulomb constant is 8.98755 X 109 N*m2 / C2 What is the strength of the electrostatic force on the top charge? Answer in units of N. Length of each side is .19m Photo...

What is the best way to collect electrostatic charge from particles in an airtight system? The particles will pass over a collector (that which we are trying to determine), discharge and be circulated away. I'm just not exactly sure what to use. It will either be just plain air, or possibly a...

hi in what direction does the electrostatic force act when we insert a dielectric within a capacitor? and when we remove the dielectric? supposedly they act in opposite directions in each case, and either push or pull the dielectric out or into the capacitor. i m not able to understand how the...

Homework Statement A solid sphere contains a uniform volume charge density (charge Q, radius R). (a) Use Gauss’s law to find the electric field inside the sphere. (b) Integrate E^2 over spherical shells over the volumes inside and outside the sphere. (c) What fraction of the total electrostatic...

The question : Consider a thin spherical shell of radius R with a uniform charge density sigma. If a very small piece of this surface were removed, leaving a small hole, what would the electric field be at a point just above/below the hole? Relevent info : the field due to the patch of...

Hi, please anyone hlep me this statement. I am doing online quiz. one question I am getting problem. so, i want to know this statement true or false... The electric field is perpendicular to the electrostatic force ( T or F) Thansk!.

[SOLVED] Can an electrostatic force repel or just attract? Two charged plates can't be made to repel each other right?