Coulomb's law Definition and 403 Threads

need help -- about Coulomb's Law and SHM Two positive charges +Q are held fixed a distance d apart. A particle of negative chage -q and mass m is placed midway between them, then is given a small displacement perpendicular to the line joining them and released. Show that the particle describes...

I'm working with Coulomb's law, and finding the force from known charges is easy. But I don't know how to find mass from Coulomb's law, and I guess I don't know an equation that will help. Two equally charged particles, held 3.8 x 10-3 m apart, are released from rest. The initial...

I have a couple of Coulomb's Law problems. 1) A charge of 6.00 mC is placed at each corner of a square 0.100 m on each side. Determine the magnitude and direction of the force on each charge. 2) Two charges, -Q and -3Q (subscript 0 at the end of each Q),are a distance L apart. There...

I have a question that I've worked out and am having a bit of difficulty with. The problem is: http://synthdriven.com/images/deletable/help3.jpg" This is what I've worked out: (sorry, it's a bit faint.) http://synthdriven.com/images/deletable/help2.jpg" What I did. I drew a diagram...

Hello - I worked out this problem but I got a wrong answer. First, I used the Pythagorean theorem to find the radial distance between A and each charges. So 1.2m divided by 2 (= 0.6), then the square root of .6 squared + .6 squared = .849, which is the radius. Then I used Coulomb's...

A rigid, insulating fiber runs along a portion of the y-axis; the fiber isnot free to move. Gravity acts downward (g = 9.81 m/s2).A charge Qa = -3 µC is fixed to the fiber at the origin. A bead with a hole drilled through its center is slipped over the fiber andis free to move along the fiber...

I have been working on a problem and can't seem to figure out what I'm doing wrong. Here goes: An alpha particle (charge = +2.0e) is sent at high speed toward a gold nucleus (charge = +79e). What is the electrical force acting on the alpha particle when it is 2.0 X 10^-14 m from the gold...

I'm completely stumped on three questions, please help... 1. Particle 1 of charge +1x10^-6C and particle 2 of charge -3.0x10^-6C are held at separation L=10.0cm 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...

My teacher worked out the following problem as shown below: http://img116.imageshack.us/img116/7656/naamloos27mf.gif The only thing is I don't really understand what he's doing, so could anybody please explain to me a bit more which steps he takes? I would be very greatful! (or maybe...

I can't seem to figure out how to do this problem. I've tried the equation for coulomb's law, but I can't get the right answer. If somebody can just help me with setting the problem up. Two objects ar rubbed against each other. Object B gains a charge of -5 nano-coulombs. What is the...

Electric Force! I am uncertain how to apply Coulomb's law, if this is even the right way to go about it, to this problem on Electric Force because I am not given two charges. The question is: On average, the electron and proton in a hydrogen atom are separated by a distance of 5.3x10^-11 m...

Three positive particles of equal charge,+11.0uc, are located at the corners of an equilateral triangle of side 15,0cm calculate the magnitude and direction of the net force on each particle. Here is what I got so far f1= kq1q2/r^2 =(9.0*10^9N*m^2/c^2/)(11.0*10^-6)^2= 48.4N F1 = COS30(48.4)=...

Two small silver spheres, each with a mass of 12.0 g, are separated by 1.00 m. Calculate the fraction of the electrons in one sphere that must be transferred to the other to produce an attractive force of 3.00e4 N (about 3 tons) between the spheres. (The number of electrons per atom of silver is...

ok, I am trying to do this "prelab" thing for my lab tomorrow, and there is one question i just can NOT figure out. the question is The weight of a 0.6 kg object of charge Q is just balanced by another object of equal but opposite charge fixed to a support 107 cm above it. What is the...

A particle with charge 5\muC is located on the x-axis at the point -6 cm, and a second particle with charge -8 \muC is placed on the x-axis at 10 cm. The Coulomb constant is 8.9875 x 10^9 Nm^2/C^2. What is the magnitude of the total electrostatic force on a third particle with charge 9\muC...

"Two identical small spheres of mass 2.0g are fastened to the ends of an insulating thread of length 0.60m. The spheres are suspended by a hook in the ceiling from the centre of the thread. The spheres are given identical electric charges and hand in static equilibrium, with an angle of 30.0...

A charge of -3.4 × 10-9 C is at the origin and a charge of 6.9 × 10-9 C is on the x-axis at x = 3 m. At what location on the x-axis is the electric field zero? HELP: Which region is the only possible one where the E-field could be zero (to the left of Q1, in between the charges, or to the...

I'm having trouble even beginning this problem. I'm not quite sure how to convert from the charge, which I believe I can find, to the number of electrons shared. If someone could help me understand what I'm being asked to find, and how to find it, I would really appreciate it. The problem is as...

The net force on a 1nC charge is 0. What is q? There are 3 forces. q is 2cm in the y direction away from a charge of 1nC. Another charge of 2nC is 4cm below q and 3cm to the right. The final charge is 4cm below q and 3cm to the left. Using Coulomb's law, I found the force of the two...

Electric Charges and Coulomb’s Law Guys, help me solve these problems. I'm really in big trouble.. thanks guys! a)Two charges of equal magnitude exert an attractive force of 4.0x10-4 N on each other. If the magnitude of each charge is 2.0μC, how far apart are the charge? b)Three equal...

I'm trying to derive the vector field \vec{E} = \frac{1}{4\pi\epsilon_0}\frac{q\vec{r}}{r^3} surrounding a point charge, starting with \oint_S \vec{E} \cdot \mathrm{d}\vec{A}. My uneducated guess would be to get the magnitude of the electric field from gauss' law, then integrate to get the...

Hey...i need help... "One practical arrangement for verifying Coulomb's law is to use a lightweight, negatively charged, freely-suspended ball. it is repelled by the negative charge on a larger sphere that is held near it, on an insulated support. the small angle of deflection, x is then...

Hi, What are the dimensions of K? Is it (Force x Length^2 / Charge^2), or is it dimension-less? Thanks.

I was wondering if anyone would be willing to walk me through a few problems to help prepare me for a quiz tomorrow over Coulomb's law. It'd be of great appreciation if anyone would/could help me! The first problem: Betelgeuse, one of the brightest stars in the constellation of Orion, has...

Okay, not really, but suppose it were. This is what my assignment wants me to suppose. Suppose that the actual force of interaction between two piont charges is found to be: \mathbf{F} = \frac{1}{4\pi \epsilon _0}\frac{q_1q_2}{s^2}\left (1 + \frac{s}{\lambda}\right )e^{-s/\lambda}\mathbf...

two charges, -Q and -3Q are a distance r apart. These two charges are free to move but do not because there is a third charge nearby. What must be the charge and placement of the third charge for the first 2 to be equilbrium? The answer is: The charge is 0.4Q and the distance is 0.37l...

Hello, I have a simple exercice I'm having trouble to solve. So we have a) and b) a) asked the force applied on a charge... and the answer was \vec{F_{res}.}= Qkq ( -0,222 \vec{i} -0,250\vec{j}) N that's not a problem here.. that was the good answer. Now in b), they're asking where do...

I know how to use the law with two particles and sometimes with three, but the way this problem is set up has me a bit confused. Use coulomb's law to find the electric force (magnitude and direction) on q for (a)q=2e-6 C and (b)q=-4e-6C. The picture is this *sorry I have to actually draw...

I need somebody to explain to me specifically "Forces of changed particles & Coulomb's Law", which was covered in a class I missed yesterday. Basically, I know that 8.99 x 10^-9 is a constant used in the beginning of the equation, and then after you put (q1 and q2), which i have no clue what...

Hi, the problem states the following. "Charge q2 is in static equilibrium. What is q1?" I've attached the image of the problem I'm working on. From the looks of this it should be quick and simple it seems, but I am having a tough time with it. I would appreciate any help you can offer...

Here's a question from my textbook: Two copper spheres, each having a mass of .4 kg, are separated by 2 m. (a) How many electrons does each sphere contain? The atomic mass of copper is 63.5 g/mol, and its atomic number is 29. (b) How many electrons would have to be removed from one sphere...

I cannot figure out this problem. I mean, I can't really even figure out what it is asking. I am not expecting anyone to solve it for me or anything. I just need some help as to how to get started. Particles A and B Figure 22-25a shows charged particles A and B that are fixed in place on...

does coulomb's law govern magnetic attraction and replusion also? thanks

I'm having trouble understanding how to apply the Coulomb's law equation. F=(1/4 x pi x epsilon) x (q1 x q2/r2) I know this much: F(Newtons)= {1\4 x pi x [8.854 x 10 - 12 Flow / m] (electrical permittivity)} x charge of particle 1 x...

This is the question: A balloon rubbed against denim gains a charge of -8 x 10^ -6 C. What is the electric force between the balllon and denim when they are separated by 0.05 m? That's all I know... I need to find the force between the two, all I know is the formula (Coulomb's Law), the...

I didn't know where else to post this, so sorry if this is the wrong subforum. Anyway, I bought myself a physics textbook for self-teaching purposes. I decided to take a look at its Fields chapters, and now I know how to derive Coulomb's Law using F=eE and Φ=∫ E dS. Right, so how advanced is...

I am having a problem with the following question: Two identically charged ping pong balls each having a mass of 4.00 g are hung from fine threads, 0.75 m long. What is the charge on each ball so that the angle between the threads is 35 degrees? I don't know how to draw a free body diagram...

Im reading Coulmbs law and I have stumbeled upon a problem. The numerator is the product of the two charges. But according to inductance, I can create a force of attraction between two objects if only one object has a charge. So charge two would be zero? And the force would be zero!? That does...

apparently i got the correct answer for this problem to be 8.62*10^(-5) N but when I try doing it again, I get a different answer. A particle of charge 4.96nC is placed at the origin of an xy-coordinate system, and a second particle of charge 2.02nC is placed on the positive x-axis at...

To find the magnitude of a force between two charges is very simple, but to get the direction of the force seems a little strange to me. The signs of the charges aren't included anywhere in the law, so does this mean that I literally have to think "the signs are opposite, therefore I will...

Here's my question: Starting from Coulomb's law, show that e^2/(4*pi*epsilon_0) has dimensions of energy times distance. Coulombs law is F=(1/(4*pi*episilon_0))*(q1*q2/r^2) I understand how to convert the units for e^2/(4*pi*epsilon_0), where e is the charge of the electron, to ev * nm...

have been trying this for 8 hours. have finally come up with q = Fe X r squared, divided by Ke. In the problem I have been told the value for: Fe = 5.5 x 10-9, r = 5.0 x 10 -10 and of course Ke (8.99 x 10 9) known nucleus charge is e= 1.6 x 10-19. I have been asked whether the magnitude of...

The law of lever rules without exceptions! "The ratio of the lifting weight and the weight lifted is inverse the ratio of their distances to the center" - Aristotle's followers. "Magnitudes are in equilibrium on distances reciprocally proportional to their weights" - Archimedes. See any...

Dear all... i have a question about coulomb's law as follows: if there are three point charges are placed at the x-axis, first is +C, second is -C and the last one also is -C. How could i know the direction of the force at the second and third one ?? best regards. jazz

What information does this law give us? This seems to be a different question to "what does this law mean?", which I could answer with "it describes the electrostatic force between two charges q1 and q2 separated by a distance r, the magnitude is inversely proportional to the square of the...

Can anyone help me with this one, its really giving me problems. u = 10^-6C Three positive particles of charges 12.5uC at the corners of an equilateral triangle. The sides of the triangle are 0.17meters long. Calculate the magnitude and direction of the net force on each particle. Of the...

I'm having a little trouble with this one.. Three pointlike charges Q are located on three successive vertices of a reguar hexagon with sides "l". Find the electrical force on another charge q located at the center of the hexagon. Assume all the charges are like charges. ( all positive )...

If you have two charges, one positive and one negative, you can find the electrical force using coulomb's law. What happens to the charges if you touch them together and then separate them again? Do they become like charges, and does the magnitude change? Thanks Mandy :confused:

questions relate to coulomb's law. What will happen the to force if: one of the charge was doubled. (ex.q1 was doubled) I think that the force would double as well right? What if q1 and q2 were cut in half? the distance is tripled? the distance is cut in half? How do I figure...

questions relate to coulomb's law. What will happen the to force if one of the charge was doubled. (ex.q1 was doubled) I think that the force would double as well right? What if q1 and q2 were cut in half? the distance is tripled? the distance is cut in half? What if q1 was...