# coulomb law

1. ### Electric Flux through a circle

Hi! My main problem is that I don't understand what the problem is telling me. What does it mean that the surface is a flast disc bounded by the circle? Is the Gauss surface the disc? Does that mean that inside the circle in the figure, there is a disc? Can you give me some guidance on how to...
2. ### Force of one distribution of charge on another

1. Homework Statement I need help on solving this exercise : We have a ring of radius = $a$ uniformly charged (total charge = $Q$) and on its axis a segment $OA$ (length = $a$ also) of uniformly distributed positive electric charges with the charge density $\lambda'$ and of total...
3. ### Problem in electrostatics: E-field near 2 point charges

1. Homework Statement Refer the image. 2. Homework Equations kq1q2/r^2 = F Potential energy = kq1q1/r 3. The Attempt at a Solution Obviously since both charges are unequal in magnitude option a is incorrect. Calculating field at large distance r, E = kq1/r^2 - kq2/r^2 = kq2/r^2 Also...
4. ### B How do you calculate voltage from Coulomb’s equation?

I know that the equation F = CQ1Q2/r^2 can be rearranged to give electric field measured in volts per meter and then arearranged to get voltage but I don’t thing the answers I get are correct. I once got 10^9 volts between 2 coulombs 2 meters apart? I am really confused please help.
5. ### Ball's electric charge

I don't really know how to fit what i want to this template, but i'll try. The thing is that i wonder if anyone can explain to me step-by-step what happened in this solution, because i don't really understand it. 1. Homework Statement There are two balls. Upper one(mass m, charge Q) hung on a...
6. ### Coulomb's Law Grade 12 Question -- Net Electric Field affecting a Charge

1. Homework Statement Examine the charge distribution shown. b) What is the net electric field acting on charge 1? 2. Homework Equations I used the equation E= (kq1/r^2) + (kq2/r^2) 3. The Attempt at a Solution I subbed 9.0 x 10^9 in for k, 3.0 x 10^-5 for both q1 and q2, and 2m for r. My...
7. ### Electric field magnitude between two charged disks problem

1. Homework Statement Consider two thin disks, of negligible thickness, of radius R oriented perpendicular to the x axis such that the x axis runs through the center of each disk. (Figure 1) The disk centered at x=0 has positive charge density η, and the disk centered at x=a has negative charge...
8. ### Calculate the total force on Q1

1. Homework Statement Q1<------>Q2<------>Q3 In the above figure, the distance between Q1 and Q2 is equal to the distance between Q2 and Q3. That distance is R=1.5 m. Q1= 2.24x10-6 C, Q2=+Q1 and Q3=-Q1. Calculate the total force on Q1. Give your answer with a positive number for a force...
9. G

### Electric field due to semi-circular wire at a distance

1. Homework Statement A semi-circular wire containing a total charge Q which is uniformly distribute over the wire in the x-y plane. the semi-circle has a radius a and the origin is the center of the circle. Now I want to calculate the electric field at a point located on at distance h on the...
10. ### Angle between 2 charged spheres hanging from string

1. Homework Statement Two positively charged metal spheres are suspended from the same hook by light strings of equal length, making an angle of 10.0◦ with each other. The charges carried by the spheres are as shown in the diagram. After that, the spheres are brought in contact briefly, then...
11. ### I Electric field created by point charges and conducting plane

I came upon this: http://physics.stackexchange.com/questions/174514/will-the-electrostatic-force-between-two-charges-change-if-we-place-a-metal-plat/323006#323006 question on Physics Stackexchange which I found very interesting. The configuration is basically two positive point charges q and...
12. ### I How to write the unit vector for the spherical coordinates

So I'm reading the Schaum's outlines while trying to prepare for a big test I have in September. And I'm trying to understand something here that maybe someone can offer some clarification and guidance. So, using Coulomb's Law, we can find the electric field as follows: dE...