Electrostatic Definition and 857 Threads

Is there a simple curve that 2 particles follow when there's a repulsive electrostatic force - like there is for gravitational forces? I don't know how to solve the differential equation that you get for the motion. Laura

I have attempted this problem twice and have one more chance before I get the "red ex" so I thought I'd check my thinking. Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of 0.136 N when their center-to-center separation is 65.0 cm. The...

1) 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) [I actually have a numerical value for n to use to find my final answer]. Along this pole, of length we will call d, there is another charged sphere which is located at an...

Identical isolated conducting spheres 1 and 2 have equal charges and are separated by a distance that is large compared with their diameters. The magnitude of the electrostatic force acting on sphere 2 due to sphere 1 is F = 8.9 N. Suppose now that a third identical sphere 3, having an...

I read Feynman's quantum electrodynamics, but I do not clearly understand, where quantum mechanics enter. So if clasicaly force in electrostatic field equals F = e^2 /4 pi epsilon 0 r^2. What happens, when quanum mechanics is included. I think that for elementary principle we do need...

Im having a little problem with this question Not sure where to start but I believe that a 3D taylor series expansion might be useful. Please could someone urgently help me out as it is due in a few hours! Thanks for your time. GM

Hi, I've been doing some reading on electrostatic influence machines like this one here called Nicholson's Doubler: [PLAIN]www.coe.ufrj.br/~acmq/nicholson.html[/URL] I was wondering if there is any drag force or back attraction/repulsion torques that the rotating disks would experience...

Griffiths : Electrostatic Energy I'm having a little difficulty in understanding how one arrives at the following expression for electrostatic energy of a continuous charge distribution. W = \frac{\epsilon_o}{2}\int (\vec{E})^2d\tau This result is obtained when the volume of integration...

I have an example in my book showing 3 point charges each at the vertices of an equilateral triangle. q1 = +2 microC, q2 = -2 microC, and q3 = +1 microCoulombs. the distance between each is 0.30m. The example calculates the electrostatic potential energy of the charge configuration, obtaining...

"Two charges, q1, and q2, are located at the origin and at (0.50m, 0), respectively. Where on the x-axis must a third charge, q3, of arbitrary sign be placed to be in electrostatic equilibrium if (a) q1 and q2 are like charges of equal magnitude, (b) q1 and q2 are unlike charges of equal...

Two identical balls of mass 38 g are suspended from threads of length 1.5 m and carry equal charges of 16 nC as shown in the figure. Assume that θ is so small that its tangent can be replaced by its sine and find the value of x. (picture attached) I know that the sum of all the forces must...

show that the potential energy due to electrostatic forces of uniformly charged sphere of radius R and total charge Q is: 3Q^2/5R i don't even know how to start?? i really don't want to hate physics:frown: :frown: :frown: i was reading through in my textbook and they only gave...

Electrostatic conundrum: How "brute force" and symmetry arg. give different answers! Hello everyone, this is my first post -- and an interesting one (or so I think). **Note to Mods: this is NOT me asking for a solution to a HW type problem -- I know and have the solution already -- rather...

Im having trouble following how this is derived: The normal component of the electric field is discontinuous by an amount sigma/epsilon_0 at any boundary (when you cross a continuous surface charge). They talk about taking a little box so that the surface integral E dot da = 1/epsilon_0 * sigma...

A conducting spherical shell of ineer radius a and outer radius b carries a net charge Q. A point charge q is placed at the center of this shell. Determine the surface charge densit on (a) the ineer surface of the shell and (b) the outer surface of the shell. I'm not sure of my reasoning...

Hi, I have the following question: An uncharged wooden stick is balance on a pivot so that it can rotate freely. If a charged rod is brought close to one end of the stick, the stick will be... Attracted by the charged rod is the answer. This has got me confused for a while. Here is my...

http://www.imagebucket.net/images/bigslowy/physicsproblem.jpg What is the strength of the electrostatic force on the top charge? Answer in units of N. I tried breaking it down into components of Fabx + Fbcx ect. but I still don't get a correct answer. Is there a different approach I...

Hey! I just got this new electrostatic generator and I wanted to know if any of you guys have any cool experiments I could try. So far I have just managed to zap myself and make my hair stand up. Anyone have any ideas for how to make cool experiments?

I am having difficulties with the following problem. I have gotten parts (a) and (b) (my correct answers are shown below), but I cannot figure out how to do part (c). Any help with it would be greatly appreciated. Thanks! ------------ The charges and coordinates of two charged particles...

Hey, Here is my question: Three identical small Styrofoam balls (m = 2.05 g) are suspended from a fixed point by three nonconducting threads, each with a length of 45.5 cm and with negligible mass. At equilibrium the three balls form an equilateral triangle with sides of 28.4 cm. What is the...

I apologize in advance - I am completely clueless about this one. I thought I had it figured out, but it turns out that I think I don't know where to even start. Four particles form a square. The charges are q1 = q4 = Q and q2 = q3 = q. What is Q/q if the net electrostatic force on particles...

I'm stuck on the following problem: Point charges of q_1=-12nC are placed at (-4,0) cm and (4,0) cm. Determine the magnitude of the electrostatic force on a third charge of q_2=20nC placed at (0,8) cm. So because of symmetry I figured that the x-components of the forces will cancel each other...

This is more of a general question and not a homework question, just to make it clear. Say two test charges are brought separately, one after the other, into the vicinity of a charge +Q. First test charge +q is brought to point B a distance r from +Q. This charge is removed and a test charge -q...

Hello, although being graduated in physics (but not being an expert on QED) I find myself embarassed in trying to explain in very simple terms how the electrostatic force arise from the exchange of virtual photon. Especially when it comes to actually reduce all calculations to the expected...

Can someone explain this law to me in simple terms? I know that it is the electrostatic force between 2 charged objects in relation to the quantity and inversly related to the square of distance F=K q1 q2 / d^2 ..but what if you have atoms that are spearated by a certain distance and have...

Hello everyone, Did I do the 2nd part of this problem correct? Part B. I boxed in the answer, i think it will just be easier by showing you my drawing so here is the picture -> http://img221.imageshack.us/img221/9340/phsyicss9lb.jpg thanks!

Find the direction and magnitude of the net electrostatic force exerted on the point charge q2 in Figure 19-31. Let q = +1.8 µC and d = 41 cm. Direction ° (from the x-axis, which points to the right) Magnitude N *image of diagram* http://www.webassign.net/walker/19-31.gif

electroscope A large electroscope is made with “leaves” that are 78-cm-long wires with tiny 24-g spheres at the ends. When charged, nearly all the charge resides on the spheres. If the wires each make a 3.0E1° angle with the vertical (see figure), what total charge Q must have been applied to...

time as a function of distance? electrostatic force C = coulombs, Ke = electrostatic constant, d = distance, m = mass of electrons, v = velocity, c = a constant F(d) = (KeC^2)/d E(d) = (KeC^2) * integral (1/d) dd = KeC^2(lnd2 - lnd1) E = 1/2 mv^2 v = sqrt(2E/m) =...

Hi all, I am sorry this could sound like heard many times before, but I am trying to understand this problem and found nothing in my physics books. If I put a small dielectric (bit of paper) into an electrostatic field (for example generated by a rubbed plastic rod), the paper will be...

Hey-- I'm trying to model the bending of a beam due to electrostatic forces. (Femlab does offer this model on their website, but the module I'd need to run it costs $600!) I have no problem modeling a beam bending, and I have no problem creating a parallel plate capacitor, but when I...

I am currently working through section 2.5 of Griffiths' electrodynamics, specifically the part which deals with electrostatic pressure in conductors. I encountered the following question (question 2.39, or 2.38 in earlier versions): A metal sphere of radius R carries a total charge Q...

Three identical point charges of 2 micro C are placed on the x-axis. The first charge is at the origin, the second to the right at x = 50 cm (.5 m), and the third at the 100 cm (1 m) mark. What are the mag. and direction of the electrostatic force which acts on the charge on the origin? The...

Potential at ANY point on a spherical shell due to external point charge Hi everyone Here is another problem: A point charge q is placed at a distance of r from the center of an uncharged conducting sphere of radius R (< r). Find the potential at any point on the sphere. I know the...

http://forum.lowyat.net/index.php?act=Attach&type=post&id=46273 Hi there, I've been trying this question quite long but I do not get the answer, could anyone help me? For part one, i got the answer... part (ii) ... i saw it in a book saying i suppose to choose a point to get the...

Sphere A carries a net charge and sphere B is neutral. Both are conducting spheres and they are placed near each other on an insulated table. Which statement best describes the electrostatic force between them? a) there is no force b/w them since one is neutral b) there is a force of...

I have just started electricity in physics and am wondering how to do this homework questions. The question is: Sphere A and B are insulated metal spheres with charges of +10 micro C and -5 micro C respectively. If sphere A has twice the radius of sphere B, what will be the charge on each...

Well,I've tried attempting this problem but I am not sure if I approached it the right way. Here is a link for the diagram and the question. [PLAIN]http://img.photobucket.com/albums/v367/crazy_cat_lady/physics/diagram1.bmp[/URL] If anyone could check it over and point out any mistakes...

Consider a solid sphere of radius R containing a total charge Q which is uniformly distributed throughout the volume with a volume charge density rho. a) find the total force exerted by the electrostatic field on the charge in the 'northern hemisphere'. express your answer in terms of the...

Have a problem that I'm not sure how to approach any help would be appreciated! If the electrostatic force between two protons is equal to 1x10^-7 Newtons, what is the distance between them?

Trying to understand some course material and I decided to look into electrostatic speakers. I can't seem to apply electrostatic theory formulaes to the speaker model. There are two stators and a diaphragm in the speaker, my current guess is that the two stators act like a capacitor and hence...

Prove that for charge-free two-dimensional space the value of the electrostatic potential at any point is equal to the average of the potential over the surface of any circle centered on that point. Do this by considering the electrostatic potential as the real part of an analytic function...

Electric fields and electrostatic forces (1 question) I was wondering if someone can show me how to answer this problem. Thank you. 1)Two charges are placed on the x-axis, an unknown positive charge at x=0 cm and a negative 8.642e-6 C charge at 2.993 cm from the origin. Calculate the...

Could someone please help me figure out how to determine the net electrostatic force and direction in this question? I have completed what I believe to be the first portion using Coulomb's Law for the force acting on the origin charge (F12 and F13) A charge of -3.0 micro C is fixed at the...

Can someone help me with this problem: Consider a simplified model of the singly-ionized helium atom, He+: 2 protons plus 2 neutrons in the nucleus, "orbited" by one electron at a constant distance of 2.65 x 10^-11m. a. What is the magnitude of the attractive electrostatic force between...

Point charges q1 and q2 are placed in space, with q1 at the origin and q2 a distance r from q1 making a 45 degree angle with the horizontal. a) Find the force using unit vectors i and j from q1 to q2 b) " " from q2 to q1 c) If q1=q2, what is...

Hi all, I have a few questions that I'd appreciate some guidance on. There are two identical dust particles:- mass 13ug charge +9.8E-15 C electrostatic potential energy 8.7E-17 J gravitational potential energy 1.1E-24 J The mass is given in the question, the energies I calculated...

A person accumulates a net charge of -59uC, how many excess electrons does this person get and by how much does her mass increase?

Doing my physics homework a few weeks ago led me to some startling conclusions (this doesn't really happen often, don't worry too much.) We were learning about electrostatic field energy, and I was doing a problem involving the finding of the electrostatic field energy of a sphere, but later in...

I've included a picture. Two charges Qc and -Qc(Qc = 4 µC) are fixed on the x-axis at x = -7 cm and x = 7 cm, respectively. A third charge Qb = 5 µC is fixed at the origin. A particle with charge q = 0.3 µC and mass m = 5 g is placed on the y-axis at y = 14 cm and released. There is no...