charges

  1. F

    Finding the electric field along the line between charges

    Hey So I've been asked this question as part of my physics assignment (Its an advanced section question so significantly harder than the normal questions) and I've been stuck, my intuition tells me there should be two zero points, and initially I found a formula that only found one, however...
  2. J

    Net electric field between two negative charges

    Hi, having a problem understanding the net electric field midway between to negative charges of different magnitude. -4.0microC-------------------------------------------------5.0microC My thinking is that the fields oppose one another but the -5.0microC charge is greater so the...
  3. J

    Electric potential energy of the system of three charges

    1: The electric potential energy of two point charges approaches zero as the two point charges move farther away from each other. If the three point charges (two positive, one negative) lie at the vertices of an equilateral triangle, the electric potential energy of the system of three...
  4. R

    At which point is the net electric field between 2 charges 0?

    Two charges -8 µC and +2 µC are fixed in space and separated by a distance of 5.0m. At what point along the line joining the two charges is the net electric field equal to zero. Locate the point relative to the negative charge. What would be the force on a charge of +12 µC placed at this...
  5. B

    Finding the Electric Field as a Result of Two Point Charges

    The problem: There is a −3 µC point charge at (0,0,4) and a +3 µC point charge at (0,0,-4). What is the magnitude and direction of the electric field at point (0,0,8)? What is the magnitude and direction of the electric field at point (4,4,0)? The attempt at a solution: It should be as simple...
  6. I

    2 charges moving in a train which comes to a sudden stop.

    Consider a train moving in a certain direction and there are 2 points charges, one of them is put at the front-end and the other is of opposite charge put at back-end and I am interested to examine the electric force between them relative to different observers. Now consider the train comes to...
  7. A

    3 point charges, must find net force on each

    Ok, I have 3 charges on the 3 points of an equilateral triangle. A is negative in the bottom left corner while B and C are positive in the top and bottom right position, respectively. The magnitude of each charge is 5*10^6 C and the length of each side is .03 m. They're asking for the net...
  8. M

    Finding net force and frequency of an oscillation due to charges.

    Two equal magnitude negative charges (–q and –q) are fixed at coordinates (-d, 0) and (+d, 0). A positive charge of the same magnitude, q, and with mass m is placed at coordinate (0, 0), midway between the two negative charges. If the positive charge is moved a distance δ << d in the positive...
  9. H

    Charges forces

    Please help me on this question. Write a description of force on situation in the two cases: (with formulas) Case 1) Two stationary charges (+) (+) Case 2) Two charges moving with the same velocity, v, in the same direction: (+) => v (+) => v
  10. B

    Two Charges and a Grounded Conducting Sphere

    Hi all, I'm familiar with how to solve the problem of one point charge a distance from the center of a grounded conducting sphere. However, I'm stuck on this problem (To be solved using Method of Images): Consider a system of two charges +q at z=-a and -q at z=a and a grounded conducting...
  11. K

    Questions Related to Coulomb's Law and Charges Distributions

    I got these 3 questions for my homework. I tried it nearly a whole day but... (Doh) Here is my picture of the problem and my work http://img4.imageshack.us/img4/441/003bgk.jpg The only thing I'm in trouble with is how can I find F act on 1 'cause of 6 (F16) ? The book gives me something with...
  12. B

    electrical charges and forces

    hello i am stuck on a problem and was wondering if anyone here can help. Four identical charges, +Q, occupy the corners of a square with sides of length "a". A fifth charge, q, can be placed at any desired location. Find the value of q, such that the net electric force acting on each of the...
  13. B

    charges, formula, please help

    Hi everyone, could you help me with this task? i have to find out how long "d" can possibly be by making a function using the formula E= k*(Q/r*r) (Q being the charge, E the electric field, r the distance, k the constant [9*10 on the ninth] the black curves in the picture being the...
  14. S

    How does a connecting wire prevent static charges from accumulating?

    The scenario is this: An oil tanker is refuelling an aircraft through a pipe. I understand that friction between the fuel and pipe will lead to electron transfer, hence charge accumulation in both the pipe and the fuel. So we should "get rid" of the charge on both pipe and fuel, right? How do...
  15. J

    Question on Charges

    Hi everyone Electric charges A and B are attracted to each other. Electric charges B and C repel each other. What if A and C are held close together? Explain. my answer:say A is positive and B is negative A+ B- (attract) B- and C- (repel) when A and C are held together, they are...
  16. A

    Movement of charges

    An electron has an initial speed of 2 Mm/s in the direction x. The electron enters a uniform electric field E = 400j N/C which is the direction y. (a) Calculate the acceleration of the electron. (b) What the time interval required for the electron traveled 10 cm in x direction ? (c) What is the...
  17. C

    Help with point charges

    Two point charges +4.1 mC and -2.2 mC are placed on the x-axis at (11m, 0) and (-11m, 0), respectively. Find the point on the x-axis to the left of the negative charge where the electric potential vanishes. I'm really having trouble with this problem. Could someone please help me out?
  18. I

    Charges on capacitors...

    Capacitors C1 = 4.0 μF and C2 = 2.0 μF are charged as a series combination across a 100-V battery. The two capacitors are disconnected from the battery and from each other. They are then connected positive plate to positive plate and negative plate to negative plate. Calculate the resulting...
  19. P

    Electric Charges

    Include an FBD where appropriate. On a separate sheet of paper, show all of your work. If you take any shortcuts, be sure to indicate your reasoning. Q1 = 30μC, Q2 = 50μC and Q3 = -30μC. (a) What is the magnitude of the net force on Q2? (b) If Q2 has a mass of 2.6 x 10-3 kg, what is its...